That the Capacity of a Plant Species to Adjust Itself, Due to a Change N Environmental Temperature, Is Genetically Controlled
122 that the capacity of a plant species to adjust itself, due to a change n environmental temperature, is genetically controlled. The différences in physiological adjustments among genotypes are P^i'"^'^;^^',^" ,^^^^,f,\P^^'^ of heat acclimation (heat adaptability) rather than ^", \^^\ \"^^^r^^^^^ ^^^î tolerance. This adaptive character, which protects plants against heat stress, works only if the heat adaptability can occur rapidly (J), so that the damage would not occur, which in turn results in better crop performance. References 1. Kigel, J. and M. Ofir. 1981. The morphogenetic processes that determine yield in french bean. Reports to A.R.O., Ministry of Agri., Israel. 2. Chen,\^ii\.M, ii.ii.,H.H., Z.Y.A.. I. oiiciiShen aiiuand r.M.P.H. ui.Li. 1982.• ^^i-» ,^—~^~~Adaptability ___X.__ of crop plants to high temperature stress. Crop Sei., 22:719-725. 3. Shen, Z.Y. and P.H. Li. 1982. Heat adaptability of the tomato. HortSci. 17:924-925. ««»«« INTERNAL CONTAMINATION OF BLACK BEAN SEED LOTS WITH XANTHOMONAS BLIGHT BACTERIA FROM DIFFERENT STATES OF VENEZUELA Nancy Contreras de Velasquez and Gustavo Trujillo Escuela de Postgrado, Facultad de Agronomía Universidad Central de Venezuela, Maracay Venezuela To evaluate the internal bacterial contamination in black bean seed lots, a survey was conducted with 176 samples from different classes of seed' such as: genetic, foundation, registered, certified, and harvested from growers and experiments. The survey came from different States of the Country Anzoategui, Apure, Aragua, Carabobo, Guarico, Lara, Monagas, Portuguesa, Sucre, Trujillo and Yaracuy. The samples of 80 g from each lot were weigthed, the surface was sterilized during 2 minutes with 2,6% NaOCl, rinsing twice in sterile wa ter and incubated in a shaker for 48 hr in the following enrichment medium (SEM): 1,0 g yeast extract, 25 mg cycloheximide, 2 mg nitrofurantoin, 1 mg nalidixic acid in 1000 ml 0,01 phosphate buffer pH 7.2.
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