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Propagule Type Affects Growth and Fruiting of Uapaca Kirkiana, A

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Propagule Type Affects Growth and Fruiting of Uapaca Kirkiana, A HORTSCIENCE 44(6):1662–1667. 2009. traits and precocious fruiting (Akinnifesi et al., 2006). According to Akinnifesi et al. (2006), fruiting precocity of U. kirkiana Propagule Type Affects Growth and (fruiting within 2 to 3 years after planting) has been achieved using grafting and layering Fruiting of Uapaca kirkiana, a Priority (marcottage) techniques, whereas saplings start fruiting 10 to 16 years after establish- Indigenous Fruit Tree of Southern ment. This long time to fruiting has been one reason that farmers have been reluctant to cultivate U. kirkiana in the past (Ajayi, Africa 2007). The grafting technique is now suc- Festus K. Akinnifesi, Simon A. Mng’omba1, and Gudeta Sileshi cessful (80% graft take), although this de- World Agroforestry Center (ICRAF), Agroforestry Program, Chitedze pends on the skill of the grafters, time of the year when scions are collected, and the Research Station, P.O. Box 30798, Lilongwe 3, Malawi interval between scion collection and graft- Thomson G. Chilanga ing (Akinnifesi et al., 2006, 2008). Despite the knowledge of vegetative prop- Bvumbwe Agricultural Research Station, P.O. Box 5748, Limbe, Malawi agation techniques, little is known about the Jarret Mhango effects of different propagation systems on the partitioning of dry matter in and even on the Mzuzu University, Private Bag 201, Luwinga, Mzuzu 2, Malawi phenotypic characteristics of the germplasm. Oluyede C. Ajayi, Sebastian Chakeredza, Betserai I. Nyoka, Vegetative propagation of physiologically ma- ture trees is generally meant to capture the and France M.T. Gondwe phenotype and mature phase of the tissues to World Agroforestry Center (ICRAF), Agroforestry Program, Chitedze promote early flowering and fruiting without Research Station, P.O. Box 30798, Lilongwe 3, Malawi passing through the juvenile phase. The development of nonphotosynthetic tis- Additional index words. crown depth, dwarfing, Euphorbiaceae, fruit abortion, fruiting sues such as flowers and fruits can have a precocity, miombo woodland negative effect on the development of support- Abstract. One of the limitations of Uapaca kirkiana on-farm cultivation is the long ing branches (O’Brien et al., 1995), and hence juvenile phase to reach a stable fruiting stage. Marcots and grafts have been identified as it is expected that allocation of growth resour- feasible and reliable propagation methods for precocious fruiting, but the effects of ces, biomass, and phenotype is likely to differ different propagule types on tree growth and fruit yield have not been evaluated. There is among trees derived from different stocks. limited knowledge on development and growth forms for trees derived from different Trees that allocate fewer resources to support- propagules. Grafts and marcots were compared with saplings to assess the variability in ing stems and trunks per unit growth height 1) field growth and fruiting of U. kirkiana; and 2) dry matter allocation pattern and tree should grow faster than those that allocate development models among trees derived from different propagules. Tree development more (O’Brien et al., 1995). The tradeoff is on models were used to examine differences among trees from different propagules. The survival: self-supporting plants that allocate results show that number of branches and fruit load significantly differed between too little to stems may buckle under their own vegetative propagules and saplings, whereas tree height, root collar diameter, crown mass or break as a result of wind stress or other spread, and fruit size and weight were similar 8 years after establishment. The results loads (O’Brien et al., 1995). suggest differences in intraspecific scaling relationships between height and diameter A phenotype is a constellation of biolog- among propagule sources. Saplings showed a significantly better fit (r2 = 0.891; P < ical traits such as photosynthetic area (As), 0.0001) to the scaling relationship than grafts (r2 = 0.724; P = 0.002) and marcots (r2 = stem radius (r0), height or plant length (L), 0.533; P = 0.018). After 3 years, marcots and grafts started producing fruits. Fruit load and whole plant mass (M) that often covary was greatest in marcots despite some fruit abortions; thus, marcots had greater fruit with each other during ontogeny through yield, early growth, and development and better dry matter allocation. some scaling relationship (Niklas, 1993; Price et al., 2007). According to Price et al. (2007), each relationship can be expressed in terms of continuous traits dependent on Many indigenous fruit trees (IFTs) of the of food security to rural households during network geometry as follows: miombo woodlands of southern Africa are periods of food scarcity (Akinnifesi et al., A } Mq; r } M aq; L } Mbq; L } rb/a; important for the livelihoods of the rural 2008a). Other benefits from the use of IFTs s 0 0 1/a 1/b population (Akinnifesi et al., 2008a). This include the biological diversification of farm- As } r0 ; As } L (1) has been shown by market and financial ing systems, nutritional security, and employ- analyses, which have attested that fresh and ment opportunities (Mith¨ofer and Waibel, where a and b are parameters that character- processed fruit products of IFTs contribute to 2008). Integrating and managing IFTs on ize the geometry of the vascular networks in a household income and that women and chil- farmland could be a way to enhance agricul- given species and q is the scaling exponent, dren are the main beneficiaries (Ramadhani, tural sustainability through the improvement and it is equal to 1/(2a+b). 2002). IFTs can make a difference in terms of fruit and tree traits (Kruise, 2006). Several hydrodynamic and anatomical Uapaca kirkiana Mu¨ell Arg. belongs to attributes of plant hydraulics and branching the Euphorbiaceae family and is a priority morphology are determined by q (Enquist IFT for domestication in countries of south- et al., 2007; West et al., 1999). West et al. Received for publication 18 May 2009. Accepted ern Africa (Akinnifesi et al., 2008b). How- (1997, 1999) hypothesized that the value of for publication 18 June 2009. ever, U. kirkiana harvest comes from the wild q arises from the geometry of vascular net- We thank BMZ and GTZ for providing funds for and the lack of knowledge about its vegeta- works and resource exchange surfaces. implementing the project on ‘Domestication and Marketing of Indigenous Fruit Trees for Improved tive propagation has been a constraint to The core assumption of this theory is that Nutrition and Income in southern Africa’ and EC its domestication (Akinnifesi et al., 2008b; many organismal, anatomical, and physio- and CIDA Canada for providing leveraging funding. Mng’omba et al., 2007). Vegetative propa- logical traits are linked mechanistically by 1To whom reprint requests should be addressed; gation using cuttings, grafting, and layering allometric scaling of the vascular network e-mail [email protected]. can capture and fix superior fruit and tree (Price et al., 2007; West et al., 1999). The 1662 HORTSCIENCE VOL. 44(6) OCTOBER 2009 PROPAGATION AND TISSUE CULTURE scaling of the height of dicotyledonous trees under U. kirkiana trees to provide mycorrhi- examined using the deviance and likelihood has been examined principally in terms of zal inoculum. The marcots were kept in the ratio statistics. Because inclusion of the inter- elastic and stress similarity models (Niklas, nursery for 8 months before planting them in action term did not improve model fit and 1993). The elastic similarity model assumes the field. parsimony, only the main effects were ana- that the deflection at the free end of a support Whip grafting was done when U. kirkiana lyzed. In all cases, statistical inference was member remains constant relative to the seedling rootstocks were 2 years old and 10 based on the 95% confidence intervals of length or height (H). This assumption re- mm (diameter) and 40 to 60 cm tall. Seeds parameter estimates rather than post hoc test quires H to scale to diameter (d) as follows: were collected from different trees in Pha- statistics. This is because the 95% confidence lombe forest woodland (lat. 16°09# S, long. interval functions as a very conservative test of H} d2/3 (2) 34°29# E, 1260 m above sea level) and sown hypothesis that attaches a measure of accuracy The stress similarity model is based on the to raise seedlings. Some of seedlings were to sample statistics (Sim and Reid, 1999). assumption that a constant maximum stress used as rootstocks for the grafted plants, and We considered models for the scaling of level exists throughout the length of colum- hence the seedling rootstocks and saplings tree height (H) with stem diameter (d)in nar tree trunks. This assumption requires H to were of the same age and origin (Phalombe various treatments. An agreement between scale to d as follows (Niklas, 1993): provenance). Scions (1 to 2 years old) were observed H and fitted H using different collected from the forest woodland in Zomba models (Eqs. 2 and 3) across the whole range 1/2 H} d (3) (Zomba provenance). This provenance was of mean diameters was graphically evaluated. selected for scion collection because of its This was done by plotting H values against Therefore, we hypothesized that marcots and proximity to the study site. The scions and the respective d values. This agreement was grafted trees will not conform to the optimiz- marcots were from Zomba provenance, but statistically tested using least square linear ing assumptions underlying the scaling rela- not necessarily from the same trees. There- regression of observed values against fitted tionships proposed for naturally growing fore, we hypothesized that if there was no values (used as independent variable). This trees (Price et al., 2007; West et al., 1999) provenance difference, if any, then it has an method was found to be more robust than in a similar manner. insignificant influence on early growth of the testing model fit with regression of fitted We expected saplings to be taller than planting materials.
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