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While leaf ontogeny has an
important effect on leaf size, it is distinctively modified by
environmental factors such as temperature, day length, irradiance
etc. (Kirby and Appleyard 1987). Deviations were noticed in
Ditelo-2AS, 3AS, 3AL, 1BS, 1BL, 5BL, 7BL, 2DL and 3DS, all of which
decreased the flag-leaf size except Ditelo-3AL and 5BL
(Table
1). This
indicates the presence of positive tendency genes on 3AL and 5BL,
i.e. genes that increase the size of the flag-leaf. Earlier reports
on flag-leaf size revealed the effect of these chromosomes (Sridevi
et al 1989). The other chromosomes which, according to our study,
affected flag-leaf size were Ditelo-1AS, 1AL, 4AL, 5AL, 7AL, 4BS,
6BS, 4DS, 4DL, 6DS, 6DL, 7DS and 7DL
(Table
3). All of these
had a negative effect on the size of the flag leaf, i.e., the size of
the flag-leaf was reduced in these ditelos. As the characters under
study are quantitative, the effect of many chromosomes on these
characters has been observed. Our analysis led to the location of
genes governing days to heading, spike length and flag-leaf size on
different chromosomes.
References
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