นิเวศพันธุศาสตร์ของพืชสกุลถั่วแปบช้าง (Afgekia Craib) ในประเทศไทย / ปรีชา ประเทพา = Ecological genetics of the genus Afgekia Craib in Thailand / Preecha Pratapa
The genus Afgekia Craib has been found for the first time in Thailand, represented by two species; Thua paep chaang (Afgekia sericea Craib) and Kan phai (Afgekia mahidolae Burtt & Chermsirivathana) and from the most up to data information they seem to be endemic to Thailand. The present research is aim to investigate the phylogenic relationships of the two species by means of morphological analyses, genetical and physiological studies. From the analysis of twenty morphological characteristics using discriminant method, sixteen characters are responsible to distinguish the two species. However, the two species are very similar in their pollen morphology with slightly different in their size and exine sculpturing. Cytological studies was demonstrated that the two species have the same chromosome number, 2n = 16 and 8 bivalents was found in microsporocyte during first metaphase. Pollen viability test of both species shows highly percentage of viability (90%), but however, no pollen was found to germinate on the medium studied. Polyacrylamide gel electrophoresis of two isozyme systems : peroxidase and esterase, successfully differented the two species. Ecophysiological studies using plant growth analysis and determination of total chlorophyll as well as soluble protein contents expressed in the same way that Kan phai had significantly higher growth attribute than Thua paep chaang. To sum up, the evidence from morphological analyses and genetical studies show that the two species of Afgekia have some phylogenic relationships. Whereas the results of ecophysiological investigation indicate that each species has been well adapted to each ecological environments.