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Influence of flag leaf characteristics on pollen sterility of rice (Oryza sativa L.) under heat stress

Authors:

L. C. Silva ,

Field Crops Research and Development Institute, Mahailluppallama, LK
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H. G. B. P. Dharshana,

Field Crops Research and Development Institute, Mahailluppallama, LK
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W. M. W. Weerakoon,

Department of Agriculture, Peradeniya, LK
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D. M. D. Dissanayake

Rajarata University of Sri Lanka, Anuradhapura, LK
About D. M. D.
Department of Plant Sciences, Faculty of Agriculture
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Abstract

Late flowering-affected spikelet sterility was found in dry zone of Sri Lanka. It was defined as a combination effect of air temperature and relative humidity at anthesis. It is considered important to develop mitigation options to avoid temperature stress. Therefore, the impact of some phenotypic markers on pollen sterility was studied. This paper highlights flag leaf characteristics regulate the direct sunlight penetration and augment the spikelet surface temperature. A field trial was conducted at the Field Crops Research and Development Institute, Mahailluppallama, Sri Lanka during 2013/14 and 2014/15 Maha seasons (main cultivating season; October to February). Due to water shortage, this experiment was not conducted in the Yala season (March to September). A split plot design was adopted with early and late planting as a main factor and two rice (Oryza sativa L) varieties (Bg358 and Bg366) and two rice lines (Bg3171 and Bw03-1198) as a sub factor, in a two factor factorial arrangement. Flag leaf characters at late booting stage, daily maximum air temperature and relative humidity during anthesis were recorded. Spikelet surface temperature and pollen sterility were recorded throughout the flowering period. Spikelet temperature changed with air temperature. While synchronizing high temperature in late flowering, the spikelet temperature increased. However, significant temperature changes were occurred only in 2014/15 Maha season. Pollen sterility was affected by late planting with genotypic variations. Flag leaf length and area correlated (R2 = -0.79 and -0.78 for pollen fertility and -0.74 and -0.75 for spikelet temperature) with spikelet surface temperature and pollen sterility. The best combinations of flag leaf characters to obtain the maximum canopy cooling with lesser spikelet temperature in 85 cm2 of flag area and 55.0 cm of flag leaf length. Therefore, it is better to select rice varieties having longer flag leaf than panicle with lesser leaf temperature for variety development programmes aimed at temperature stress.

How to Cite: Silva, L.C., Dharshana, H.G.B.P., Weerakoon, W.M.W. and Dissanayake, D.M.D., 2018. Influence of flag leaf characteristics on pollen sterility of rice (Oryza sativa L.) under heat stress. Sri Lanka Journal of Food and Agriculture, 4(2), pp.29–38. DOI: http://doi.org/10.4038/sljfa.v4i2.62
Published on 28 Dec 2018.
Peer Reviewed

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