High ethylene production slackens seed filling in compact panicled rice cultivar |
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Authors: | Binay Bhusan Panda Ekamber Kariali Rashmi Panigrahi Pravat K Mohapatra |
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Institution: | (1) School of Life Science, Sambalpur University, Jyoti vihar, Sambalpur, 768019, India |
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Abstract: | Change of plant type in rice resulting in increased compactness of the panicle, allows space for accommodation of a larger
number of spikelets, but grain yield does not increase proportionately because of limitations in grain filling. The objective
of this study was to evaluate potential causes of poor filling of spikelets by comparing the physiological processes that
influence source and sink activities between a compact- (OR-1920-7) and a loose-panicled (Lalat) rice cultivars growing in
the open field conditions in the farm of Regional Research and Technology Transfer Station, Orissa University of Agriculture
and Technology, Chiplima, India during dry season of 2007. Although grain number per unit length of the branches was higher
in the compact-panicled cultivar than the loose-panicled cultivar, average grain weight was lower on the primary and secondary
branches at top, middle and basal positions of the panicle in the former compared to the corresponding positions of the panicle
in the latter. Compared to Lalat, ethylene production rate was considerably higher in the boot of the flag leaf sheath of
OR-1920-7 during the pre-anthesis period. Ethylene evolution rate correlated negatively with growth and cell division rates
and starch concentration of the juvenile endosperm. Because spikelet growth was slower in OR-1920-7 than in Lalat, unused
carbohydrates accumulated in the endosperm. The stomatal conductance of the flag leaf during this period was also lower in
the former than that of the latter and it correlated negatively with ethylene evolution rate of the boot. It is concluded
that high ethylene production slackened grain filling of compact-panicled rice cultivar OR-1920-7 because of its adverse influence
on both source and sink activities. |
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Keywords: | Rice Compact panicle Ethylene Spikelets Assimilates |
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