Correlation of Leaf and Root Senescence During Ripening in Dry Seeded and Transplanted Rice
Received date: 2018-01-04
Accepted date: 2018-04-17
Online published: 2018-06-11
Dry seeding is a resource-saving rice establishment method. With an equivalent yield, dry seeded flooded rice (DSR) has been considered as a replacement for traditional transplanted flooded rice (TFR). However, the differences in leaf and root senescence during grain filling between DSR and TFR were seldom identified. In this study, the root length, root tip number and leaf senescence of rice varieties Huanghuazhan and Yangliangyou 6 during ripening were compared between DSR and TFR. Results showed that top three leaves in DSR had the characteristics of relatively lower SPAD value, lower N content and premature leaf senescence. In addition, both the total root length and total root tip number of DSR were significantly lower than those of TFR. In conclusion, premature and quick leaf senescence was related with inadequate root length and root tip number during ripening, which might result from the deficiency of nitrogen supply in DSR. Techniques on improving leaf nitrogen status and delaying the leaf senescence during grain-filling in DSR should be developed in future researches.
Hongyan Liu, Weiqin Wang, Aibin He, Lixiao Nie . Correlation of Leaf and Root Senescence During Ripening in Dry Seeded and Transplanted Rice[J]. Rice Science, 2018 , 25(5) : 279 -285 . DOI: 10.1016/j.rsci.2018.04.005
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