Growth, physiological and biochemical responses of Malaysia rice cultivars to water stress
The response of water deficit on rice plants varies substantially according to cultivars. Drought tolerant cultivars possess better morphological, physiological and biochemical adaptation to reduce water availability. An experiment involving water stress on rice varieties was carried out under rai...
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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/6977/ http://psasir.upm.edu.my/6977/ http://psasir.upm.edu.my/6977/1/Growth%2C_Physiological_and_Biochemical_Responses.pdf |
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| Summary: | The response of water deficit on rice plants varies substantially according to cultivars. Drought tolerant
cultivars possess better morphological, physiological and biochemical adaptation to reduce water availability.
An experiment involving water stress on rice varieties was carried out under rain shelter to examine the
morphological changes (leaf rolling, root depth), stomatal responses and biochemical processes (proline
and peroxidase accumulation) of five different local rice varieties. These varieties were selected based on
their drought tolerant potential from an earlier varietal screening trial. The varieties were taken from both
traditional (Muda, Jawi Lanjut and newly breed commercial varieties, MR 84, MR219 and MR 220) obtained
from Genebank, MARDI Research Station, Seberang Prai, Kepala Batas, Pulau Pinang. These varieties
were exposed to two different water regimes; water stress by withholding water and well watered condition
(control). The experiment was carried out in a Complete Randomized Design (CRD) with 4 replicates. Water stress plants exhibited lower growth rate with obvious variation among rice varieties on the sensitivity
to water stress. Meanwhile, the overall sensitivity of the varieties to water stress was ranked in the order;
MR220>Muda>MR84>MR219>Jawi Lanjut. Water deficit decreased stomatal conductance, relative water
content and root depth while peroxidase activities and proline accumulation were increased in rice grown
under water stress treatment. |
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