植物生态学报 ›› 2023, Vol. 47 ›› Issue (11): 1600-1610.DOI: 10.17521/cjpe.2022.0490

所属专题: 光合作用

• 研究论文 • 上一篇    

棉花花铃期叶片氮分配对光合氮利用效率的影响

冯旭飞1, 雷长英1, 张玉洁1, 向导2, 杨明凤2, 张旺锋1, 张亚黎1,*()   

  1. 1石河子大学农学院, 新疆生产建设兵团绿洲生态农业重点实验室, 新疆石河子 832003
    2新疆乌兰乌苏农业气象试验站, 乌兰乌苏国家综合气象观测专项试验外场, 新疆沙湾 832199
  • 收稿日期:2022-12-06 接受日期:2023-04-06 出版日期:2023-11-20 发布日期:2023-12-22
  • 通讯作者: 张亚黎(zhangyali_cn@foxmail.com)
  • 基金资助:
    国家自然科学基金(31860355)

Effect of leaf nitrogen allocation on photosynthetic nitrogen use efficiency at flowering and boll stage of Gossypium spp.

FENG Xu-Fei1, LEI Zhang-Ying1, ZHANG Yu-Jie1, XIANG Dao2, YANG Ming-Feng2, ZHANG Wang-Feng1, ZHANG Ya-Li1,*()   

  1. 1College of Agriculture, Shihezi University, Key Laboratory of Oasis Ecology-Agriculture, Xinjiang Production and Construction Corps, Shihezi, Xinjiang 832003, China
    2Wulanwusu Agro-Meteorological Experiment Station of Xinjiang, Wulanwusu National Comprehensive Meteorological Observation Special Test Field, Shawan, Xinjiang 832199, China
  • Received:2022-12-06 Accepted:2023-04-06 Online:2023-11-20 Published:2023-12-22
  • Contact: ZHANG Ya-Li(zhangyali_cn@foxmail.com)
  • Supported by:
    National Natural Science Foundation of China(31860355)

摘要:

为探讨棉花(Gossypium spp.)叶片净光合速率(Pn)与氮分配的关系, 分析影响光合氮利用效率(PNUE)提高的限制因子, 揭示氮利用效率的光合生理调控机制, 该研究在花铃期测定包括陆地棉(G. hirsutum)、海岛棉(G. barbadense)、树棉(G. arboreum)和草棉(G. herbaceum) 16个基因型棉花的气体交换参数、不同组分氮含量与比例和单位面积细胞壁含量(CWarea)等, 分析Pn、CWarea、PNUE与各组分氮含量之间的关系。结果表明: 当单位面积氮含量(Narea)小于3.75 g·m-2时, Pn与Narea呈极显著正相关关系, 超过此值, 它们之间无相关关系; 而Pn与光合机构中的核酮糖-1,5-双磷酸羧化酶/加氧酶(Rubisco)氮含量(Nr)和生物力能学氮含量(Nb)呈显著正相关关系, 与捕光系统氮含量(NL)呈边缘性正相关关系, 表明光合机构氮含量(Np)比Narea对光合能力更为重要; 此外, Pn也与气孔导度(Gs)呈显著正相关关系。基因型‘常紫1号’低的Pn主要与低Np有关, 而基因型‘МОС-620’低的Pn主要与低Gs有关。光合机构各组分氮分配比例也与PNUE呈显著或极显著正相关关系; 但光合机构各组分氮分配比例受自身Narea和CWarea影响。相关分析表明, 生物力能学氮分配比例(Pb)和捕光系统氮分配比例(PL)与Narea极显著负相关; Rubisco氮分配比例(Pr)、PL和Pb分别与CWarea显著、极显著和边缘性负相关。表明随着Narea和CWarea增加, 叶片倾向于非光合机构氮分配, 包括储存氮组分和细胞壁组分。此外, 细胞壁可能通过影响叶肉导度(gm)降低Pn和PNUE。增加光合机构氮分配比例, 降低非光合机构的氮分配比例以及增加gm可提升基因型‘常紫1号’和‘МОС-620’的PNUE。

关键词: 净光合速率, 光合机构氮组分, 光合氮利用效率, 单位面积细胞壁含量, 棉花

Abstract:

Aims The purpose of this study is to investigate the relationship between net photosynthetic rate (Pn) and nitrogen allocation in Gossypium spp. leaves, to analyze the limiting factors that affect the improvement of photosynthetic nitrogen use efficiency (PNUE), and to reveal the photosynthetic physiological regulation mechanism of nitrogen use efficiency.

Methods In this study, the gas exchange parameters, nitrogen content and proportion of different components, cell wall content per unit area (CWarea) of 16 genotypes of Gossypium spp., including G. hirsutum, G. barbadense, G. arboreum and G. herbaceum, were measured at flowering and bolling stages. The relationship between Pn,CWarea, PNUE and nitrogen content of different components was analyzed.

Important findings The results showed that when nitrogen content per unit area (Narea) was less than 3.75 g·m-2, the Pn was very significant positively correlated with Narea, When Narea exceeds this value, the Pn was not correlated with Narea, while Pn had a significant positive correlation with Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) nitrogen content (Nr) and bioenergetics nitrogen content (Nb), a marginal positive correlation with light harvesting system nitrogen content (NL) in photosynthetic apparatus, indicating the nitrogen content of photosynthetic apparatus (Np) plays more important role than Narea in the photosynthetic capacity. In addition, Pn was also positively correlated with stomatal conductance (Gs). The low Pn of genotype ‘CHANG ZI 1 HAO’ was mainly related to low Np, while low Pn of genotype ‘MOC-620’ was mainly related to low Gs. The proportion of nitrogen components in photosynthetic apparatus was also significantly and inversely correlated with PNUE. However, the fractions of nitrogen allocated to photosynthetic apparatus components were affected by Narea and CWarea. The correlation analysis showed that the fraction of nitrogen allocation to bioenergetics (Pb) and light harvesting system (PL) was inversely correlated with Narea; the fraction of nitrogen allocation to Rubisco (Pr), PL and Pb were significantly, extremely significant and marginally negatively correlated with CWarea, respectively. The results showed that with the increase of Narea and/or CWarea, leaves tended to allocate nitrogen to non-photosynthetic apparatus, including stored nitrogen component and cell wall component. In addition, cell wall may reduce PNUE by influencing mesophyll conductance (gm). It’s likely to improve the photosynthetic nitrogen use efficiency in genotype ‘CHANG ZI 1 HAO’ and ‘MOC-620’ by increasing the fraction of N allocation to photosynthetic apparatus and decreasing allocation to non-photosynthetic apparatus.

Key words: net photosynthetic rate, nitrogen components of photosynthetic apparatus, photosynthetic nitrogen use efficiency, cell wall content per unit area, Gossypium spp.