Effect of drought stress at reproductive growth stage on the degeneration, sterility, ripening and nutrient uptake of rice plant

This experiment was conducted to investigate the effect of drought stress applied at the reproductive growth stage on degeneration, sterility, filling and nutrient uptake of rice. Drought shortened culm length, panicle length and degree of panicle exertion where shortening response was greater at th...

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Published inThe Research Reports of The Rural Development Administration (Korea R.) Vol. 31; no. 1
Main Authors Hwang, C.J, Kim, K.T, Oh, N.K, Jeong, J.U. (Chonbuk Provincial Rural Development Administration, Iri (Korea R.))
Format Publication
LanguageKorean
Published 01.06.1989
Subjects
ABSORCION DE SUBSTANCIAS NUTRITIVAS
ABSORPTION DE SUBSTANCES NUTRITIVES
ARROZ
CRECIMIENTO
CROISSANCE
ESTERILIZACION
MADURACION
MATURATION
REPRODUCCION
REPRODUCTION
RIZ
SECHERESSE
SEQUIA
STERILISATION (GERMES)
STRESS
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Summary:This experiment was conducted to investigate the effect of drought stress applied at the reproductive growth stage on degeneration, sterility, filling and nutrient uptake of rice. Drought shortened culm length, panicle length and degree of panicle exertion where shortening response was greater at the meiosis stage than at the panicle formation stage when lower internodes was decreased, where as higher internodes at the meiosis stage. Number and degeneration ratio of spikelets and secondary branches were affected due to drought stress. The degeneration ratio of these corresponded to higher drough stress at panicle formation stage than meiosis stage. Sterility ratio and impediment of grain filling were also increased. Sizes of unhulled and hulled rice were decreased by drought that remarkably decreased in thickness of grain. The decrease was less when the drought was applied at meiosis stage as compared when the drought applied at the panicle formation stage. As the duration of drought stress was increased, the total nitrogen content in leaf blade, stem and panicle was increased, but the silicate content decreased. The highest content of nitrogen and silicate was obtained in leaf blade but phosphate and potassium contents were high in stem. There was correlation between ratios of sterility, grain filling and degeneration of spikelets and secondary branches and ratio of silicate to total nitrogen of leaf blade, stem and panicle. These had closer relationship with nutrient contents in panicle than those in leaf blade and stem
Bibliography:8935649
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