Abstract:
:Cashew (Anacardium occidentale L.), introduced into India about 400 years ago, is distributed widely in the coastal regions as spontaneous populations as well as in cultivation. Despite the plant's commercial exploitation, little is known about its actual introduction and diversification. We attempted to construct these events by investigating the level of genetic variation and genetic structure of cashew populations collected from different geographical regions of India. A total of 91 individuals from four populations were analysed using AFLP markers and morphometric data. AFLP analysis based on 354 polymorphic loci revealed Indian cashew to have low but relatively substantial genetic diversity for an introduced species (H(E) = 0.262 and I(S) = 0.404). Twenty-seven qualitative and quantitative traits also revealed the existence of considerable morphometric variation (24% around the mean values). Bayesian cluster analysis based on AFLP data did not indicate the existence of definite population differentiation. Morphometric analysis allocated 12% variation among all four populations, whereas AFLP variation observed in cashew individuals was entirely within populations. The results, supporting the possibility of cashew having been introduced into India repeatedly over a period of time but at a single location (west coast), are discussed and their implications for germplasm management are described.
journal_name
Genomejournal_title
Genomeauthors
Archak S,Gaikwad AB,Swamy KR,Karihaloo JLdoi
10.1139/G08-119subject
Has Abstractpub_date
2009-03-01 00:00:00pages
222-30issue
3eissn
0831-2796issn
1480-3321pii
g08-119journal_volume
52pub_type
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