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Rice Grain Chalkiness Is Negatively Correlated with Root Activity During Grain Filling 被引量:5

Rice Grain Chalkiness Is Negatively Correlated with Root Activity During Grain Filling
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摘要 Field and pot experiments were conducted using indica rice varieties with differential chalkiness. There were significant differences in root activity among the varieties. The percentages of chalky grains and chalky area were both negatively correlated with root activity expressed as α-naphthylamine oxidation ability (RA) per gram of fresh root (RAfw) , RA per spikelet (RAgrn), or RA per sink capacity (RAsink). The RAsink was more closely related to chalkiness than RAt, and RAgrn when varieties differed greatly in panicle size and grain weight. Application of NO3^--N fertilizer at heading resulted in higher root activity and reduced chalkiness. Application of 30 mg/L NaN3 (respiration inhibitor) resulted in reduced root activity and increased chalkiness for one variety 'GD9501', but for the other variety 'Qinluai' was in reverse. The percentages of chalky grains and chalky area were negatively correlated with root activity at 10 days after heading under different chemical treatments (r=-0.8567^* and r=-0.9211^**, respectively). Field and pot experiments were conducted using indica rice varieties with differential chalkiness. There were significant differences in root activity among the varieties. The percentages of chalky grains and chalky area were both negatively correlated with root activity expressed as α-naphthylamine oxidation ability (RA) per gram of fresh root (RAfw) , RA per spikelet (RAgrn), or RA per sink capacity (RAsink). The RAsink was more closely related to chalkiness than RAt, and RAgrn when varieties differed greatly in panicle size and grain weight. Application of NO3^--N fertilizer at heading resulted in higher root activity and reduced chalkiness. Application of 30 mg/L NaN3 (respiration inhibitor) resulted in reduced root activity and increased chalkiness for one variety 'GD9501', but for the other variety 'Qinluai' was in reverse. The percentages of chalky grains and chalky area were negatively correlated with root activity at 10 days after heading under different chemical treatments (r=-0.8567^* and r=-0.9211^**, respectively).
出处 《Rice science》 SCIE 2005年第3期192-196,共5页 水稻科学(英文版)
基金 Guangdong Provincial Natural Science Foundation(20010102) the PhD-Degree-Bearer's Startup Foundation of Guangdong Academy of Agricultural Sciences(00-Boshi-05).
关键词 CHALKINESS root activity nitrate nitrogen sodium azide rice (Oryza sativa) chalkiness root activity nitrate nitrogen sodium azide rice (Oryza sativa)
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