Uptake and utilization of different nitrogen forms in erect panicle japonica rice cultivar
2019
Yi, Jun | Gao, Jiping | Zhang, Wenzhong | Xin, Wei | Zhao, Yanze | Li, Ziang | Zhao, Chen | Zhao, Ying
The response of rice to nitrogen (N) was compared between three rice cultivars and three N treatments: 1:0, 0:1, and 1:1 NH₄ ⁺:NO₃ ⁻. The three rice cultivars used were: Shennong1401 (SN1401, erect panicle rice cultivar) and Habataki and Sasanishiki (curved panicle rice cultivars). At the booting stage, higher gene expression and enzyme activity associated with N metabolism of rice in the including-NO₃ ⁻ solutions effected the secondary assimilation of N metabolism, and ultimately increased grain development. During the tillering stage, lower NO₃ ⁻ uptake rates and glutamine synthetase and NADH-dependent glutamate synthase activity in Habataki and Sasanishiki under the NO₃ ⁻ treatments resulted in lower effective panicle number per plant. However, no significant differences were observed in the grain yield per plant of SN1401 between NH₄ ⁺ and NO₃ ⁻ treatments. Our results indicate that the erect panicle rice cultivar can grow better under the including-NO₃ ⁻ treatment.
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