Mulberry genetic resource
1995
Panapa Saksoong | Lertluk Ngernsiri | Amornrat Promboon | Chanchai Thawon-anukunkit (Kasetsart Univ., Bangkok (Thailand). Faculty of Science. Dept. of Genetics)
Total number of 48 mulberry accessions were collected, planted and maintained at Kasetsart University, Kampaengsaen Campus. Of these, 38 were local while the other 10 were introduced varieties from various sources. Since very little knowledge was known in the local varieties, evaluation of mulberry characteristics was concentrated on this group in both basic botanical aspects as well as some economical important traits which would be useful for the breeding programme. Accordingly, the descriptive studies were based on morphological characters of leaf, flower and bud. Some of the characters were recorded statistically, especially those of the leaf morphology which diversified greatly and hence, the most difficult in decision making as to what was the real trait of the variety. Evaluation of economical characters were specifically performed in some of the very important traits so as to save the limitted means and time; the traits of propagation such as sprouting and rooting; yield such as internode distance, lobation and leaf weight; Leaf quality such as moisture retention capability, moisture content and finally the nutrition value of the leaf by bioassay and by biochemical analysis. As there were wide variation on traits due to the cross fertilization nature of mulberry, attempts on classification of the local varieties based on morphology faced difficulty. The present report had tried the new means of systematic study by introducing the gel electrophoresis technique in order to detect the genetic variation at the molecular level. Only peroxidase and isocitrate dehydrogenase were carried out. Obviously, if a larger number of enzymes were evaluated, this recent technology could certainly help in variety identification.
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