Chinese Journal OF Rice Science >
Characteristics of Nitrogen Absorption and Utilization of an indica-japonica Hybrid Rice, Yongyou 2640
Received date: 2021-03-21
Revised date: 2021-05-26
Online published: 2022-01-10
【Objective】It is very important to elucidate the characteristics and mechanism of nitrogen (N) uptake and utilization in indica-japonica hybrid rice. 【Method】 An indica-japonica hybrid rice combination Yongyou 2640 and two inbred rice cultivars of Lianjing 7 (japonica) and Yangdao 6 (indica) were field-grown, and six N application rates (0, 100, 200, 300, 400, 500 kg/hm 2) and a 15N tracer micro-area experiment were designed. 【Result】 With increasing N rates (from 0 to 400 kg/hm 2), the grain yield of Yongyou 2640 increased, and that of Lianjing 7 and Yangdao 6 increased first and then decreased, and the highest grain yield was found at the N rate of 300 kg/hm 2. At the same N rate, grain yield of Yongyou 2640 was higher than that of Lianjing 7 or Yangdao 6. A higher grain yield of Yongyou 2640 was mainly attributed to the higher above-ground dry matter and total amount of spikelets. The accumulation of 15N in grains increased, whereas the distribution ratio of 15N in grain decreased gradually correspondingly with increasing N application rates. A high N rate caused a drop in N harvest index. The distribution ratio of 15N in grains of Yongyou 2640 was higher than that of Lianjing 7 or Yangdao 6, while lower than that of the two control cultivars in the stems, sheaths and leaves of Yongyou 2640. The activities of nitrate reductase, glutamine syntetase and glutamate synthase in leaves of the three rice cultivars were enhanced with increasing N rates. At the same nitrogen rate, the activities of above enzymes in Yongyou 2640 were significantly higher than those of Lianjing 7 or Yangdao 6. 【Conclusion】 The indica-japonica hybrid rice Yongyou 2640 is characterized by stronger nitrogen uptake and utilization capacity as compared with inbred japonica rice cultivar (Lianjing 7) or indica rice cultivar (Yangdao 6).
Key words： rice; 15N tracer technique; nitrogen rate; uptake and distribution
YUAN Rui, ZHOU Qun, WANG Zhiqin, ZHANG Hao, GU Junfei, LIU Lijun, ZHANG Weiyang, YANG Jianchang . Characteristics of Nitrogen Absorption and Utilization of an indica-japonica Hybrid Rice, Yongyou 2640[J]. Chinese Journal OF Rice Science, 2022 , 36(1) : 77 -86 . DOI: 10.16819/j.1001-7216.2022.210310
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