Causes of sterility in seed set of rice under salinity stress

By Z. Abdullah, M. Khan, T. Flowers. 2001

214 citations recorded by the source corpus.

The effects of salinity at 50 mm NaCl on floral characteristics, yield components, and biochemical and physiological attributes of the sensitive rice variety IR-28 were studied under controlled conditions to determine the causes of sterility in seed set under salinity stress. The results showed significant decreases in panicle weight, panicle length, primary branches/panicle, filled seeds/panicle, unfilled seeds/panicle, filled seeds/plant, unfilled seeds/plant, total seeds/panicle, total seed weight/panicle, 1000-seed weight and total seed weight/plant. The sodium content in different leaves and floral parts increased significantly. In contrast, the potassium content was decreased significantly in leaves and floral parts. A reduction in chlorophyll a and b was also noted in different parts of the leaves. Inhibition of transpiration and photosynthesis was observed in flag leaves at the grain-filling stage. Soluble carbohydrates in different leaves were reduced significantly in salinized plants but their content in different floral parts was increased, with the exception of primary and secondary branch spikelets. Under salinity stress, total protein concentration in flag, second and third leaves were higher than in control plants. The viability of rice pollen was reduced significantly in salinized plants. It was further observed that starch synthetase activity (alpha1-4-glucan glucosyle transferases) in developing rice grains was inhibited very significantly under salinity stress. From these results, it is inferred that sterility and significant reductions in seed set in rice were not merely due to reduction or inhibition of different biochemical constituents and physiological functions, but were mainly due to limitation of soluble carbohydrate translocation in primary and secondary spikelets, accumulation of more sodium and less potassium in all the floral parts, and highly significant inhibition of specific activity of starch synthetase in developing rice grains, thus resulting in failure of seed set.

Subfields: Plant Science

View Paper: https://www.semanticscholar.org/paper/5afbb34daf984b4bab49684614ce825b79946131

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In Plant Science

1. Kamrun Nahar
2. M. Hasanuzzaman
3. M. Fujita
4. S. Grattan
5. A. Shereen
6. S. Prasad
7. A. Läuchli
8. Vasudha Singh

Citations in the corpus

• Effect of salinity stress on plants and its tolerance strategies: a review (2015, background): “Also reduced viability of pollen under stress condition could result in failure of seed set (Abdullah et al. 2001).”
• Plant Response to Salt Stress and Role of Exogenous Protectants to Mitigate Salt-Induced Damages (2013, background): “Also reduced viability of pollen under stress condition could result in failure of seed set (Abdullah et al. 2001 ) .”
• SALINITY EFFECTS ON SEEDLING GROWTH AND YIELD COMPONENTS OF DIFFERENT INBRED RICE LINES (2005, background): “The severe inhibitory effects of salts on fertility may be due to the differential competition in carbohydrates supply between vegetative growth and constrained its distribution to the developing panicles (Murty & Murty, 1982), whereas other is probably linked to reduce viability of pollen under str”
• PLANT GROWTH AND DEVELOPMENT UNDER SALINITY STRESS (2007, background): “The effects of 50 mM NaCl on floral characteristics, yield components and biochemical and physiological attributes of rice were studied to better understand the causes of sterility in rice (Abdullah et al., 2001).”
• Response of Rice under Salinity Stress: A Review Update (2016, background): “The destructive effects of salinity include retarded plant growth due to increased Na+ concentration [15], delay in flowering and impaired fertility, with partial or complete grain loss resulting in poor panicle development in rice [16-19], reduced P3+,K+ and Ca2+ concentrations [13], inhibition of ”
• Effect of salinity on composition, viability and germination of seeds of Chenopodium quinoa Willd (2007, background): “Not much information is available in the literature on the effect of salinity on soluble carbohydrate translocation in floral parts and grain-filling (Abdullah et al. 2001).”