Cytoplasmic male-sterility and source of pollen influence the expression of resistance to sorghum midge, Stenodiplosis sorghicola |
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Authors: | HC Sharma |
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Institution: | (1) 502 324 Andhra Pradesh, India |
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Abstract: | Sorghum midge, Stenodiplosis (Contarinia) sorghicola (Coquillett), is an important pest of grain sorghum, and host plant resistance is an important aspect of control of this
pest. This research investigated how cytoplasmic male-sterility and source of pollen influence the expression of resistance
to sorghum midge. Sorghum midge emergence was significantly lower in panicles of midge-resistant and midge-susceptible cytoplasmic
male-sterile lines when pollinated with AF 28 - a midge-resistant restorer line, than those pollinated with Swarna - a midge
susceptible restorer line, indicating the presence of xenia effects. Maintainer lines (B-lines) of midge-resistant parents
had significantly lower numbers of eggs and larvae than the B-lines of midge-susceptible parents. Male-sterile lines of the
both midge-resistant and midge-susceptible lines were equally susceptible, indicating that resistance to sorghum midge is
influenced by factors in the cytoplasm of the B-line. These findings will have an important bearing on the production of hybrids
with resistance to insects.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | plant resistance pollen effects resistance mechanisms Sorghum bicolor Stenodiplosis sorghicola sorghum midge |
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