Pollen and seed yield components of water-stressed cultivated and weedy rice
Water stress occurring during the early phase of the reproductive growth stage may influence plant reproduction success. The objectives of this study were to evaluate the responses of pollen and seed yield components to water stress during anthesis in cultivated rice (Oryza sativa L.) varieties an...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Universiti Putra Malaysia Press
2009
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| Online Access: | http://psasir.upm.edu.my/id/eprint/4694/1/pollen_and_seed_yield.pdf http://psasir.upm.edu.my/id/eprint/4694/ http://www.pertanika.upm.edu.my/Pertanika%20PAPERS/JTAS%20Vol.%2032%20(2)%20Aug.%202009/21%20Pages%20293-303.pdf |
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| Summary: | Water stress occurring during the early phase of the reproductive growth stage may influence plant reproduction
success. The objectives of this study were to evaluate the responses of pollen and seed yield components to
water stress during anthesis in cultivated rice (Oryza sativa L.) varieties and weedy rice strains. Studies were
conducted in 2007 using three cultivated rice varieties; MR 84, MR 219 and MR 232. In 2008 three weedy rice
strains were obtained from Seberang Perak, Kuala Pilah and Tanjung Karang areas. Studies were conducted in
the field where plants were grown in polybags and submerged in polyethylene tanks. Prior to anthesis, plants
were subjected to water stress by taking the plants out of the polyethylene tanks for five days. Flag leaf relative
water content (RWC) and relative injury (RI) were measured daily during the stressed period. Pollen production
and pollen viability were measured upon re-watering. Seed yield components measured were grain number
per panicle, 100-grain weight, percentage filled grain and percentage spikelet sterility at harvest. Water stress
caused a 13 – 34% decline in the number of pollen grains per anther in cultivated varieties but increased pollen
production in weedy strains. Percentage pollen viability declined by 40 – 45% in MR 219 and MR 232, but
increased by 15% in MR 84 when plants were water-stressed. Percent pollen viability in weedy strains never
exceeded 52% and significantly declined with water stress. For cultivated varieties, water stress increased
total number of grain per panicle by 31%. In weedy strains, only Seberang Perak increased in the number of
grain per panicle due to water stress. Spikelet sterility was relatively higher in cultivated varieties (16 – 50%)
compared with weedy strains (10 – 23%). The 100-grain weight was not affected by water stress in both
cultivated varieties and weedy strains. This study indicated that weedy rice strains would gain a competitive
advantage by producing more filled grains when water deficit occurs during anthesis. |
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