The Relationship Between Root Physiology and Grain Filling of Superior and Inferior Spikelets of Conventional Japonica Rice Along Yellow River Under Different Nitrogen Levels

doi:10.11924/j.issn.1000-6850.casb17100041

Abstract

Abstract: The paper aims at studying the relationship between root physiology and superior and inferior spikelets filling of two conventional japonica rice cultivars under different N levels. Two conventional japonica rice cultivars in region along yellow river,'' Zhengdao 19'' and ''Zhengdao 20'' were used for the study. Five nitrogen (N) levels, no N application and the N rate at 90 kg/ha, 180 kg/ha, 270 kg/ha and at 360 kg/ha were conducted. A field experiment was conducted to observe root physiology and superior and inferior spikelets filling of two japonica rice cultivars under different N levels. The results showed that the yield of two rice cultivars increased first and then decreased significantly with the increase of N application rate, The grain weight, grain filling rate, maximum grain filling rate and average grain filling rate in superior and inferior of two japonica rice cultivars were decreased or significantly decreased with the increase of N application rate, the time to reach the maximum grain filling rate and active filling stage increase or increase significantly with the increase of N application rate. The grain weight of inferior spikelets was lighter, the maximum grain filling rate and average grain filling rate of inferior spikelets were smaller, the time of reaching the maximum grain filling rate was later and the active filling period was longer than the superior spikelets. The root oxidation activity, root zeatin + zeatin riboside content and root active absorption surface area of two japonica rice cultivars decreased and decrease gradually increased after heading, above root physiological characteristics increased first and then decreased. The correlation analysis showed that the grain filling rate of superior and inferior spikelets was significantly or extremely significantly negatively correlated with above root physiological characteristics at early grain filling stage, the maximum grain filling rate and average grain filling rate of superior spikelets were significantly or extremely significantly negatively correlated with above root physiological characteristics, while the maximum grain filling rate and average grain filling rate of inferior spikelets were significantly or extremely significantly positively correlated with above root physiological characteristics.

CLC Number:

S511

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