文献类型： 外文期刊

作者： Liang, Ying ¹ ; Cossani, C. Mariano ³ ; Sadras, Victor O. ³ ; Yang, Qichang ¹ ; Wang, Zheng ¹ ;

作者机构： 1.Chinese Acad Agr Sci, Inst Urban Agr, Chengdu, Peoples R China

2.Sichuan Acad Agr Sci, Hort Res Inst, Vegetable Germplasm Innovat & Variety Improvement, Chengdu, Peoples R China

3.Univ Adelaide, South Australian Res & Dev Inst, Sch Agr Food & Wine, Adelaide, SA, Australia

关键词： blue light; red light; biomass allocation; nitrogen allocation; nitrogen concentration; lettuce

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：6.627； 五年影响因子：7.255 ）

ISSN： 1664-462X

年卷期： 2022 年 13 卷

页码：

收录情况： SCI

摘要： Nitrogen availability and light quality affect plant resource allocation, but their interaction is poorly understood. Herein, we analyzed the growth and allocation of dry matter and nitrogen using lettuce (Lactuca sativa L.) as a plant model in a factorial experiment combining three light regimes (100% red light, R; 50% red light + 50% blue light, RB; 100% blue light, B) and two nitrogen rates (low, 0.1 mM N; high, 10 mM N). Red light increased shoot dry weight in relation to both B and RB irrespective of nitrogen supply. Blue light favored root growth under low nitrogen. Allometric analysis showed lower allocation to leaf in response to blue light under low nitrogen and similar leaf allocation under high nitrogen. A difference in allometric slopes between low nitrogen and high nitrogen in treatments with blue light reflected a strong interaction effect on root-to-shoot biomass allocation. Shoot nitrate concentration increased with light exposure up to 14 h in both nitrogen treatments, was higher under blue light with high nitrogen, and varied little with light quality under low nitrogen. Shoot nitrogen concentration, nitrogen nutrition index, and shoot NR activity increased in response to blue light. We conclude that the interaction between blue light and nitrogen supply modulates dry mass and nitrogen allocation between the shoot and root.