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DIVERSITY and UTILIZATION of Dioscorea Spp. TUBER AS ALTERNATIVE FOOD SOURCE in NGANJUK REGENCY, EAST JAVA

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97 AGRIVITA VOLUME 37 No. 2 JUNE - 2015 ISSN : 0126 - 0537 DIVERSITY AND UTILIZATION OF Dioscorea spp. TUBER AS ALTERNATIVE FOOD SOURCE IN NGANJUK REGENCY, EAST JAVA Trimanto*) and Lia Hapsari Purwodadi Botanic Garden – Indonesian Institute of Sciences Jl. Surabaya - Malang Km 65 Purwodadi Pasuruan 67163 East Java Indonesia *) Corresponding author E-mail: [email protected] Received: December 29, 2014/ Accepted: May 14, 2015 ABSTRACT 2008). Dioscorea plants produce edible tubers, bulbils, corms or rhizomes (Islam et al., 2011). Wild Dioscorea spp. is local tuberous food crop that has edible Dioscorea tuber contents are good source potential as alternative food source to support food of protein, lipid, crude fibre, starch, vitamins security program in Indonesia. Exploration study (especially vitamin A and C) and minerals and collecting mission subjected to Dioscorea spp. (calcium, iron, phophorus, I.). In addition to have been conducted in Nganjuk Regency. The essential dietary nutrients, Dioscorea tuber also study was aimed to 1) determine the distribution of contains of antinutritional substances like total free Dioscorea spp. in Nganjuk, 2) to characterize phenolics, tannins, hydrogen cyanide, total tuber’s morphological characteristic, and 3) to oxalate, amylase and trypsin inhibitor but it can be know how tuber’s utilization by local peoples. The inactivated and eliminated by moist heat treatment results showed that there were 4 species of and soaking followed by cooking before Dioscorea found in Nganjuk. They are Dioscorea consumption (Shajeela et al., 2011). Some level of alata L, Dioscorea esculenta (Lour.) Burkill, steroid saponins and also sapogenins, such as Dioscorea hispida Dennst and Dioscorea bulbifera diosgenin are also indicated in Dioscorea tubers, L. Dioscorea alata (uwi) is the most cultivated by which is the starting material for synthesis of many farmers in Nganjuk. It has the largest cultivar steroidal hormones used as anti-inflammatory, numbers which consists of 11 cultivars. Dioscorea androgenic estrogenic and contraceptive drugs esculenta (gembili) consists of 3 cultivars and (Dutta, 2015). Dioscorea hispida (gadung) consists of 4 cultivars, Dioscorea tuber has been known and whereas Dioscorea bulbifera (uwi gantung) utilized by Indonesian people as a source of consists only 1 cultivar in one location. Farmers carbohydrates as substitute or alternative food of and local peoples play important role in rice or sago at dry season, especially in Maluku, conservation of Dioscorea in Nganjuk region by Lesser Sunda, Sulawesi and Java (Sulistiyono and cultivating and utilizing it as alternative food source Marpaung, 2004). Dioscorea is an important food for home consumption. source especially in rural communities. Traditionally, yam is a minor tuber crop with a low Keywords: Dioscorea, diversity, food source, priority commodity. Dioscorea is easily Nganjuk, utilization propagated by their tubers (Wilson, 1989) and it thrives well in marginal areas where the major INTRODUCTION crops cannot be successfully grown (Legaspi and Malab, 2013); so that it plays a crucial role for food Dioscorea genus is tuberous plant which security. The most advantageous factor from this consists of approximately 600 species; of which crop is that it can be cultivated even by the side of there are about 50-60 species have been the roads, homestead gardens, houses and in the cultivated and utilized as food and medicinal plants forest, etc. with less consideration to cultivation (Coursey, 1976). Dioscorea spp. is distributed in practices (Islam et al. 2011). the tropical, subtropical and temperate regions of Characterization data of Dioscorea spp. the world especially in West Africa, parts of both morphology and genetics is still very limited. Central America and the Caribbean, the Pacific Distribution of genotypes and their characteristics Islands and Southeast Asia (Maneenoon et al., are not well documented, which constraints the Accredited SK No.: 81/DIKTI/Kep/2011 http://dx.doi.org/10.17503/Agrivita-2015-37-2-p097-107 98 Trimanto and Lia Hapsari: Diversity and Utilization of Dioscorea spp. Tuber ……………………………….………………. efficient conservation of these genetic resources cultivated and utilized by farmers in Nganjuk thereby limiting their use in breeding programmes region for alternative food sources viz. Dioscorea (Norman et al., 2011). Proper characterization spp., Xanthosoma spp., and Colocasia spp.. and evaluation of germplasms provides reliable Exploration study subjected to Dioscorea information data (along with passport data) that spp. has been conducted in Nganjuk Regency give indication of the range of diversity in the and the tubers were then collected to be ex-situ collections, and is of considerable help to the conserved in Purwodadi Botanic Garden. The breeders to narrow the selection of potential study was aimed to 1) determine the distribution breeding stocks (Thomas and Mathur, 1991). of Dioscorea spp. in Nganjuk, 2) to characterize Such basic data are needed to be used to its tuber morphological characteristic, and 3) to determine the potential cultivars of Dioscorea know how its utilization by local peoples. tubers for further improvement programme Diversity study including distribution, agricultural In East Java - Indonesia, there are at least practices also utilization of Dioscorea in Nganjuk 35 cultivars of Dioscorea alata inventarized by may provides database for conservation and Solikin (2009) but the availability of complete further breeding program. characterization data is very shallow. Systematic work on identification of species should be MATERIALS AND METHODS conducted on Dioscorea spp. including local knowledge study regarding its utilization of crop Exploration Method to document its economic values. Every ethnic Dioscorea exploration study was group also has their own cultural practices conducted in Nganjuk Regency, East Java regarding to Dioscorea spp. cultivation. Some of Province in July 2011 with areas covered by different ethnic groups’ case study in Bangladesh some random sampling districts through direct cultivate Dioscorea spp. under hill and forests survey and observation. Information regarding shade and still have a good harvest (Islam et al., Dioscorea production were obtained from local 1997). The information about the various usages people and traders in the local markets (Figure 1). of the Dioscorea species as well as the sustainable The diversity of Dioscorea found on the sites use of this particular group of plants will be useful were noted, inventarized, and documented. Soil for future research on pharmaceutical plants, and depth of tuber at harvest time were recorded and the selection and propagation of some species of categorized to A (0-5 cm), B (5-25 cm) and C (> Dioscorea as crop plants (Mannenoon et al., 45 cm). Site and habitat informations were 2008). recorded including its latitude-longitude, habitat Nganjuk Regency is a part of East Java type, soil pH, temperature and air humidity. Province, located between 7.21°-7.50° South Information related ethnobotany of Dioscorea Latitude and 111.45°-112.131° East Longitude. It including utilization and cultivation practices were has an area of 1182.64 km2 divided into 20 taken by using open-ended interviews to local districts; bordered by Bojonegoro at the north, farmers. Jombang at the east, Kediri and Ponorogo at the southern, and Madiun at the west. Its area is Tuber Characterization Method covered by the lower mainland and the Materials observed in this study were mountains. Based on Schmidt and Ferguson, the Dioscorea spp. tubers found exploratively in climate division of Nganjuk is categorized as D- Nganjuk Regency. Characterization of the type climate since it is characterized by wet to Dioscorea spp. tubers were conducted in medium precipitation with hot temperatures. The Purwodadi Botanic Garden using ‘Descriptors for soil types are varied from alluvial, regosol, Yam (Dioscorea spp.)’ as published by andosols, latosols, and grumusol. Generally, the IPGRI/IITA (1997) and documentation of soil conditions are quite productive for various accessions were taken by digital camera. Tuber types of plants due to the support of the presence characteristics observed includes weight (kg), of Widas river and Brantas river that irrigate the shape, skin surface and flesh color. Organoleptic areas so that suitable for both food crops and tests were conducted to steamed tubers with plantation (Jatimprov, 2015). According to open- variables oberserved including flesh texture, flesh ended information, some tuber crops are still tenderness and taste. 99 Trimanto and Lia Hapsari: Diversity and Utilization of Dioscorea spp. Tuber ……………………………….………………. Figure 1. Site exploration map and distribution of Dioscorea spp. in Nganjuk Regency (Google Earth 2003) Note: TM1-28 = accession code, see Table 1 RESULTS AND DISCUSSIONS and utilized Dioscorea tubers for home consumption and some of Dioscorea tubers are for The results showed that it was 4 species of traded in local markets (Table 1). Dioscorea found and cultivated by farmers in Dioscorea alata cultivars were widely Nganjuk regions including. Dioscorea alata L., cultivated and distributed by farmers than other Dioscorea esculenta (Lour) Burkill., Dioscorea Dioscorea species. It was found in 22 locations hispida Dennst., and Dioscorea bulbifera L. (Table consist of 13 cultivars (Table 1). Economic value 1). Dioscorea alata (local name: uwi) has the most of Dioscorea alata is moderate so that
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