Abstract Detail



Systematics

RATHER, SHABIR AHMAD [1], CHUN, SU [1], ZHAO-YANG, CHANG [1].

Systematics and evolutionary significance of the pod morphological and anatomical characters with special reference to the fruit dehiscence mechanism and ancestral state reconstruction reveals evolutionary trends in genus Crotalaria L.

Pod morphological and anatomical studies were carried out in 65 species and 8 varieties of the genus Crotalaria. The pod morphology shows extreme diversity in terms of size, colour, persistence of calyx, presence of trichomes and number of seeds per pod. The pods of all the species studied are almost inflated except C. medicaginea, C. hebecarpa, C. humifusa, C. karulghata, C. notonii and C. berteroana where the pods don’t dehisce and are dispersed as diaspore. The fruits of all other species investigated had large pods and dehisce by the explosive mechanism to disperse the seeds. The narrow and longer the pod, more the helical pitch and more effective the dispersal and vice versa. The pod pericarp anatomy reveals variation in the number of layers, the type of endocarp cells and the arrangement of the cells in these layers. Pericarp is distinguishable into three broad groups: (1) equal ratio of epidermal and the sclerenchymatous cells; (2) one to three layers of the epidermal and 8-10 layers of sclerenchymatous cells and (3) 8-10 layers of epidermal cells and 1-3 layers of the sclerenchymatous cells. Evolution of pod pericarp and pod morphology was studied by reconstructing the important characters on to a phylogeny inferred from sequence data of ITS, matK, trnL-F and psbA-trnH. In addition to the normal explosive dehiscence as a means of dispersal, several species show independent evolution of modifications apparently adapted for dispersal by the wind, water and gravity as diaspore.


1 - Northwest A & F University, Yangling, College of Life Sciences, 3 Taicheng Rd, Yangling Qu, Xianyang Shi, Shaanxi Sheng, China, 712100, Xian, Shaanxi, 712100, China

Keywords:
Crotalaria, 
Pod morphology
anatomy
Dehiscence
evolution.

Presentation Type: Poster This poster will be presented at 5:30 pm. The Poster Session runs from 5:30 pm to 7:00 pm. Posters with odd poster numbers are presented at 5:30 pm, and posters with even poster numbers are presented at 6:15 pm.
Number: PSY001
Abstract ID:93
Candidate for Awards:None


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