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Morphological and physiological factors contributing to early vigor in the elite rice cultivar 9,311

文献类型： 外文期刊

作者： Shi, Zai 1 ; Chang, Tian-Gen 1 ; Chen, Faming 2 ; Zhao, Honglong 1 ; Song, Qingfeng 1 ; Wang, Mengyao 1 ; Wang, Yanjie 1 ;

作者机构： 1.Chinese Acad Sci, Shanghai Inst Plant Physiol & Ecol, Natl Key Lab Plant Mol Genet, Ctr Excellence Mol Plant Sci,CAS, Bldg 1,Room 402,Fenglin Rd 300, Shanghai 200032, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

3.Chinese Acad Sci, Shanghai Inst Nutr & Hlth, Shanghai Inst Biol Sci, CAS Key Lab Computat Biol,Max Plank Gesell,Partne, Shanghai 200031, Peoples R China

4.Huazhong Agr Univ, Wuhan 430070, Peoples R China

5.Guangdong Acad Agr Sci, Rice Res Inst, Guangdong Prov Key Lab New Technol Rice Breeding, Guangzhou, Peoples R China

6.Shandong Normal Univ, Coll Life Sci, Key Lab Plant Stress Res, Jinan 250014, Shandong, Peoples R China

期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）

ISSN： 2045-2322

年卷期： 2020 年 10 卷 1 期

页码：

收录情况： SCI

摘要： Huanghuazhan (HHZ) and 9,311 are two elite rice cultivars in China. They have achieved high yield through quite different mechanisms. One of the major features that gives high yield capacity to 9,311 is its strong early vigor, i.e., faster establishment of its seedling as well as its better growth in its early stages. To understand the mechanistic basis of early vigor in 9,311, as compared to HHZ the cultivar, we have examined, under controlled environmental conditions, different morphological and physiological traits that may contribute to its early vigor. Our results show that the fresh weight of the seeds, at germination, not only determined the seedling biomass at 10 days after germination (DAG), but was also responsible for similar to 80% of variations in plant biomass between the two cultivars even up to 30 DAG. Furthermore, the 9,311 cultivar had a larger root system, which led to its higher nitrogen uptake capacity. Other noteworthy observations about 9,311 being a better cultivar than HHZ are: (i) Ten out of 15 genes involved in nitrogen metabolism were much more highly expressed in its roots; (ii) it had a higher water uptake rate, promoting better root-to-shoot nitrogen transfer; and (iii) consistent with the above, it had higher leaf photosynthetic rate and stomatal conductance. All of the above identified features explain, to a large extent, why the 9,311, as compared to HHZ, exhibits much more vigorous early growth.

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