Studies on morphological and genetical
similarities of
Medicago murex and M. doliata to M. scutellata
Amaresh Chandra
Crop Improvement Division, Indian Grassland and
Fodder Research Institute, Jhansi
- 284 003, India
(Received: July 29, 2009; Revised received: March 08, 2010; Accepted: March 25, 2010)
Abstract: Lucerne (M. sativa L., 2n
= 4x = 32) is susceptible to weevil? (Hypera? postica Gyll) insect, hence incorporation of desirable gene (s)
from M. scutellata (2n = 30) is an important
researchable issue. Incompatibility due to incongruous chromosomal arrangements
in these two species necessitated the identification of closer species to M. scutellata (possibly progenitors). After screening 197
accessions comprising 50 Medicago species, M. murex
(2n = 2x = 14) and M. doliata (2n = 2x = 16) have
been identified as morphologically similar having compatible ploidy and genetically closer to M. scutellata
as observed with 17 simple sequence repeats (SSR) and 8 enzymes based isozyme markers. The identified accessions namely IL-04-223
and IL-04-151 of M. doliata and M. murex respectively
showing low levels (< 5%) of weevil infestation can be contemplated with
diploid M. sativa (2n = 2x = 16) to generate weevil resistant lines.
Key words: Hypera postica, Isozyme, Medicago species, SSR,
Weevil resistance
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