Non-structural carbohydrates in maize with different nitrogen tolerance are affected by nitrogen addition


Autoři: Yawei Wu aff001;  Bo Zhao aff001;  Qiang Li aff002;  Fanlei Kong aff001;  Lunjing Du aff001;  Fang Zhou aff001;  Haichun Shi aff001;  Yongpei Ke aff001;  Qinlin Liu aff001;  Dongju Feng aff001;  Jichao Yuan aff001
Působiště autorů: Key Laboratory of Crop Ecophysiology and Farming System in Southwest China, Ministry of Agriculture/College of Agriculture, Sichuan Agricultural University, Chengdu, P.R. China aff001;  Chongqing Key Laboratory of Economic Plant Biotechnology/Collaborative Innovation Center of Special Plant Industry in Chongqing/Institute of Special Plants, Chongqing University of Arts and Sciences, Chongqing, P.R. China aff002;  Crop Ecophysiology and Cultivation Key Laboratory of Sichuan Province, Chengdu, P.R. China aff003
Vyšlo v časopise: PLoS ONE 14(12)
Kategorie: Research Article
prolekare.web.journal.doi_sk: 10.1371/journal.pone.0225753

Souhrn

Non-structural carbohydrates (NSCs) are an important energy source for plant growth and metabolism. Analysis of NSC changes can provide important clues to reveal the adaptation mechanisms of plants to a specific environment. Although considerable differences have been reported in NSCs in response to nitrogen (N) application among crop species and cultivars, previous studies have mostly focused on the differences in leaves and stems. However, the effects of N on the characteristics of accumulation and translocation of NSC in maize with different levels of N tolerance remain unclear. To determine differences in the N levels, two cultivars (N-efficient ZH311 and N-inefficient XY508) were grown in field pots (Experiment I) and as hydroponic cultures (Experiment II) and were supplemented with different concentrations of N fertilizer. In both experiments, low-N stress significantly increased the accumulation of NSCs in maize vegetative organs and increased the translocation rate of NSCs in the stems and their apparent contribution to yield, thereby reducing the yield loss caused by low-N stress. N application had a greater effect on starch content in the vegetative organs of ZH311, but had less effect on soluble sugar (SS) and NSC content in the whole plant and starch content in the ears. ZH311 could convert more starch into SS under low N conditions to adapt to low N environments than XY508, while ensuring that grain yield and starch quantity were not affected. This is evidently an important physiological mechanism involved in this cultivar’s tolerance to low N conditions.

Klíčová slova:

Carbohydrates – Fertilizers – Leaves – Maize – Photosynthesis – Seedlings – Starches – Sucrose


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2019 Číslo 12