Volume 21(2), 132- 137, 2017 JOURNAL of Horticulture, Forestry and Biotechnology www.journal-hfb.usab-tm.ro

Distribution of weedy sunflower on territory of Republic of and potential risks for agriculture

Stojićević D.1, Ilić Aleksandra1, Sekulić Tatjana1, Stupar Vladanka1, Božić Dragana2, Vrbničanin Sava 2

1Higher technical school of applied science, 12000 Požarevac; 2Faculty of Agriculture, University of - 11080 Zemun

*Corresponding author: [email protected]

Abstract Sunflower is one of the main industrial crop in Republic of Key words Serbia which have five different forms: hybrid sunflower, volunteer plants, off- type plants, weedy sunflower and wild sunflower. Volunteer plants growns in weedy sunflower, next year after hybrid sunflower caused with dissipation of seed during hybridization, gene flow, harvest. Off-type plants represent errors in hybrid production and weedy resistance to herbicides sunflower is invasive plant which occurs crossing between different sunflower forms. Weedy sunflower is very present in agricultural fields and involve big loses of yield (5-35%). On teritory of Republic of Serbia weedy sunflower is mostly present in province and in small percent on other sites where farmers growing sunflower. As weed with very big habitus, weedy sunflower is hard competitor. One plant of weedy sunflower can grown 4 meters and produce 50-100 small heads (10-20 000 seeds). Distribution of weedy sunflower and mapping of sites with that species is followed during 2012., 2013., and 2014. year. Presence of weedy sunflower was indentified on almost 200 locality. Population size was in the range from 25 to 2 000 000 plants, with density on some sites even to 20 plants/m2. Genetic compatibility and flowering owerlaping between different types of sunflower allow hybridization and gene flow. Increasing of agricultural areas with hybrids of sunflower tolerant to herbicides ALS inhibitors involve increasing of risk of potential gene flow between tolerant hybrids and weedy sunflower. In our investigation, spontaneously hybridization between tolerant hybrids of sunflower and weedy sunflower was followed. The results of this investigation show decreasing of sensibility F1 progeny to herbicides ALS inhibitors. In last five years, farmers have big problems with resistance of weedy sunflower to different herbicides and herbicide groups. For that reason monitoring of weedy sunflower, their distribution, gene flow and resistance to herbicides is crucial for sustainability of agricultural production.

Invasive weeds are very important so tracing species that grows along roads, streams, penetrates the of its distribution is crucial for agriculture and arable land which is a very aggressive weed species. In environment. Many weed species are invasive on our country weedy sunflower is in invasion (18). territory of Republic of Serbia and one of them is Regulations of the list organisms harmful for plants, weedy sunflower. The genus Helianthus (Asteraceae) plant produces and regulated objects („Službeni originates from North America and covers about 51 glasnik“ Republic of Serbia registry no. 7/2010) ranked taxa among which there are annual and perennial Helianthus annuus-ruderale to list IA part II - in the species (17). The genus shows significant phenotypic harmful organisms which are known to be present in in and genetic diversity and variation in habit (14). Serbia and whose introduction and spread in Serbia are Sunflower is one of the main industrial crop in prohibited (10). It is a common weed in row crops, Republic of Serbia which have five different forms: winter wheat, orchards, vineyards and ruderal habitats hybrid sunflower, volunteer plants, off-type plants, (20). On teritory of Republic of Serbia weedy weedy sunflower and wild sunflower. Volunteer plants sunflower is mostly present in Vojvodina province and growns in next year after hybrid sunflower caused with in small percent on other sites where farmers growing dissipation of seed during harvest. Off-type plants sunflower. As weed with very big habitus, weedy represent errors in hybrid production and weedy sunflower is hard competitor. Weedy sunflower is very sunflower is invasive plant which occurs crossing present in agricultural fields and involve big loses of between different sunflower forms. This is a ruderal yield (5-35%, unpublished data). As an invasive plant,

132 weedy sunflower often growning in different Materials and Methods agricultural crops where affect the significant decrease in the yield which may range from 40-64% in maize Distribution of weedy sunflower mapping of (3), 17-19% of soybean, 28-31% sugar beet , 5-33% in sites with that species on territory of Republic of Serbia winter wheat (9). Genetic compatibility and flowering is followed during 2012., 2013., and 2014. year. For owerlaping between different types of sunflower allow the field work are used field records, GPS devices, hybridization and gene flow. Increasing of agricultural cameras and phenotypic descriptors. Many different areas with hybrids of sunflower tolerant to herbicides parameters were also recorded in field records (site, the ALS inhibitors involve increasing of risk of potential coordinates, the crop, the population size of weedy gene flow between tolerant hybrids and weedy sunflower, the degree of infestation, stage of sunflower. The exchange of genetic material also development of the crop, stage of development of the enable the transfer of AHAS gene (responsible for the weeds). Mapping was done during the summer when tolerance to ALS inhibitor herbicides) to the progeny in the sunflower was in the flowering stage which which this gene can persist for at least 5 years in significantly facilitate its monitoring. The populations volunteer plants (21), and considerably longer if the with highest density and those with some particular tolerant sunflower hybrids are grown in the vicinity. characteristics have been taken into consideration in The possibility of the transfer of genes responsible for more detail with help of the phenotype descriptor. All the sunflower resistance to herbicides to the weedy data collected in program Google earth and used for sunflower has been confirmed by (6, 11, 12, 17, 1, 5, 2) making UTM maps of distribution. and others. In our earlier investigation, spontaneously Results and Discusions hybridization between tolerant hybrids of sunflower and weedy sunflower was followed. The results of that Weedy sunflower populations are detected on investigation show decreasing of sensibility F1 almost 200 locality, mainly on ruderal and non-arable progeny to herbicides ALS inhibitors. In last five years, land, although frequently reported in maize (picture farmers have big problems with resistance of weedy 2,5), soybean, sugar beet, sunflower, wheat (picture 3) sunflower to different herbicides and herbicide groups. and vegetables. On territory of Republic of Serbia For that reason monitoring of weedy weedy sunflower is mostly present in Vojvodina sunflower and mapping of their distribution on territory province and in small percent on other sites where of Republic of Serbia is main aim of this study. farmers growing sunflower. Biggest populations are

detected on three sites (, Surčin- Galovica and Zbeg). The distance between mentioned three sites is around 20 km and it can be assumed that they are the source center. Basic information of the seventeen most specific localities are given in the table 1.

Table 1 Basic information of seventeen sites where are weedy sunflower populations detected Locality Latitude Altitude AreaPop(m2) PopSize(n) Roadside Crop Padiska Skela* 44. 9488989 79 m 30 000 2 000 000 + + Zbeg* 44. 9040472 77 m 30 000 1 000 000 + - (Frikom) 44. 9232456 79 m 10 000 50 000 + + Kovilovo (Crvenka) 44. 9148284 77m 1 000 5 000 - + Surčin (Galovica)* 44. 7911636 78 m 50 000 500 000 - + Surčin (7.jul) 44. 7777809 73 m 500 3 000 + - Toponica potok 44. 3134322 107 m 2 000 3 000 - + Toponica selište 44. 5275232 109 m 20 000 30 000 - + Dunavac 45. 0370085 76 m 400 1 000 + - Kovačica 45. 1148288 108 m 1 000 10 000 + - Pećinci 44. 8856959 85 m 500 5 000 + - Perlez 45. 2197175 84 m 1500 10 000 - + Ilandža 45. 1509491 89 m 100 200 - + Kikinda 45. 8102759 85 m 50 100 + - Požarevac tulba 44. 3862955 108 m 1 500 1 500 - + Stari Žednik 45. 9521198 116 m 200 500 - + Biteklije 44. 5400235 91 m 20 000 15 000 - + *Biggest populations

133 In our investigation we record biggest Volunteer plants was also reported because, population on locality Padinska Skela with around two after their crossing with other sunflower forms they can millions plants. More than 50% of the sites had more potentially give weedy forms which are more than 1,000 plants of weedy sunflower. On some pathes, aggressive. Volunteer plants are most frequent in crops density was extremly high (20-30 plants per m2). As of soybeans and sugar beets. They were characterized weed with very big habitus, weedy sunflower is hard by slightly larger central head and couple smaller competitor (picture 4,5). One plant of weedy sunflower heads. Steams of volunteer plants had mainly apical can grown four meters with steam full branched. branching. Presence of anthocian in different parts of plant is one Collected data were used for making UTM of the main characteristic of weedy sunflower which is map of distribution of weedy sunflower on territory of high specific for this form of sunflower. Weedy Republic of Serbia (picture 1). sunflower can produce 50-100 small heads per one plant (10-20 000 seeds).

Infestation < 5 % 5-25% 25-50% >50%

Picture 1: UTM map of distribution of weedy sunflower on territory of Republic of Serbia

134 It is believed that the Spanish explorers in the detected in Central Africa (Mozambique). It is believed sixteenth century transferred sunflower to Europe, that in Mozambique entered accidentally via the where he was first cultivated in the botanical gardens in exchange of goods and for at least two centuries are Madrid. Then he was transferred to France, England, domesticated (14). In 1978. year was first report about Germany and other European countries, where is occurrence of weedy sunflower shown by Rađenović cultivated as an ornamental plant at first. As the crop it on the territory of the Republic of Serbia (13). After has grown at the beginning of the nineteenth century, that report it comes to its rapid spread which is first in Russia (16). Weedy sunflower spreaded in documented by different researchers (15, 18, 19). A different parts of the world, including several leading review of ruderal vegetation in Pančevački Rit, countries in yield of sunflower like Argentina, France, revealed the presence of weedy sunflower H. annuus in Italy, Serbia, Spain (11) and the USA (4). Overall, six communities. The highest level is recorded in the weedy sunflower affected around 15% of sunflower presence of community- Matricaria- Helianthetum fields in France and Spain and involve yield losses annuue, where the weedy sunflower is dominant around 50% in heavily infested patches (8). Also, same species. In relation to the cover boards, which authors suggest that weedy sunflower may have arisen amounted to 11018, weedy sunflower cover was 5439 through the hybridization of cultivated and wild ie. about 49% of the total community (15). In sunflower, potentially during the seed production compartion with results of other authors, weedy process. Such crop-wild hybrids would have been sunflower originated from Republic of Serbia is introduced recurrently into fields through the seed lots, morphologicaly very similar to weedy sunflower in where they evolved to locally invasive weedy other European countries. populations. Except in Europe, sunflower as a weed is

Picture 2: Weedy sunflower in maize Picture 3: Weedy sunflower in wheat

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Picture 4: Weedy sunflower plants as hard competitor

Picture 5: High infestation of maize with weedy sunflower (site Toponica-Požarevac)

Genetic compatibility and flowering tolerant sunflower hybrids are grown in the vicinity. owerlaping between different types of sunflower allow The possibility of the transfer of genes responsible for hybridization and gene flow. Increasing of agricultural the sunflower resistance to herbicides to the weedy areas with hybrids of sunflower tolerant to herbicides sunflower has been confirmed by (6, 11, 12, 17, 1, 5, 2) ALS inhibitors involve increasing of risk of potential and others. In our earlier investigation, spontaneously gene flow between tolerant hybrids and weedy hybridization between tolerant hybrids of sunflower sunflower. The exchange of genetic material also and weedy sunflower was followed and we detected enables the transfer of AHAS gene (responsible for the decreasing of sensibility F1 generation after mentioned tolerance to ALS inhibitor herbicides) to the progeny in crossing. which this gene can persist for at least 5 years in volunteer plants (21), and considerably longer if the

136 Conclusions 8.Muller, M-H., Delieux, F., Fernandez-Martınez, J. M., Garric , B., Lecomte, V., Anglade, G., Leflon, M., Weedy sunflower is in invasion on territory of Motard, C., Segura, R. (2009): Occurrence, distribution Republic of Serbia. Almost 200 sites are detected with and distinctive morphological traits of weedy presence of weedy sunflower populations. Biggest Helianthus annuus L. populations in Spain and France. populations are on locality Padinska Skela, Surčin- Genet Resour Crop Evol, 56: 869–877. Galovica and Zbeg which are placed in radius of 20 km 9.Novák, R., Dancza, I., Szentey, L., Karamán, J. around capital city (Belgrade). Sites with biggest (2009): Arable weeds of Hungary. Fifth National Weed populations had pathes with very high density (20-30 Suevey (2007-2008). Ministry of Agriculture and Rural plant/m2). Weedy sunflower is very strong competitor Development, Hungary. and involving big loses of yield. Volunteer plants was 10.Pravilnik o listama štetnih organizama i listama also reported because, after their crossing with other bilja i biljnih prizvoda i propisanih objekata (Sl. sunflower forms they can potentially give weedy forms glasnik R.Srbije br. 7/2010) which are more aggressive. Earlier investigation of 11.Presotto, A., Fernández-Moroni, I., Poverene, M., many different authors confirmed gene flow between Cantamutto. M. (2011): Sunflower crop-wild hybrids: herbicide tolerant hybrids of sunflower and weedy Identification and risks. Crop Protection, 30. 611-616. sunflower. In last five years, farmers had big problems 12.Presotto, A., Ureta, M.S., Cantamutto. M., with resistance of weedy sunflower to different Poverene, M. (2012): Effects of gene flow from IMI herbicides and herbicide groups. For that reason resistant sunflower crop to wild Helianthus annuus monitoring of weedy sunflower, their distribution, gene populations. 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