地球与环境

文章摘要

亚硫酸氢钠对构树光合生理特性的剂量效应

Dose Effect of Sodium Bisulfite on Photosynthetic Physiological Characteristics of Broussonetia papyrifera

投稿时间：2021-03-13 修订日期：2021-05-10

DOI：10.14050/j.cnki.1672-9250.2021.49.085

中文关键词: 构树;亚硫酸氢钠;光合作用;光呼吸;叶绿素荧光

英文关键词: Broussonetia papyrifera;sodium bisulfite;photosynthesis;photorespiration;chlorophyll fluorescence

基金项目:贵州省科技计划项目（黔科合支撑[2021]一般453）；国家重点研发计划专题计划项目（2016YFC0502602）；国家自然科学基金项目（U1612441）。

作者	单位	E-mail
李中英¹, 吴沿友², 邢德科¹, 谢津津¹, 段荣荣¹, 陈天¹	1. 现代农业装备与技术教育部重点实验室, 江苏大学农业工程学院, 江苏镇江 212013 2. 中国科学院地球化学研究所环境地球化学国家重点实验室, 贵阳 550081	wuyanyou@mail.gyig.ac.cn

摘要点击次数: 176

全文下载次数: 0

中文摘要:

亚硫酸氢钠是广泛采用的光合促进剂，对作物产量具有一定的促进效果，但如果亚硫酸氢钠超过一定的剂量，可能会造成作物与土壤中硫含量超标，对人和农业生态环境都会产生极大的危害。为了研究不同浓度亚硫酸氢钠溶液对植物光合作用的影响，本研究以一年生构树（Broussonetia papyrifera）为实验材料，叶面喷施0、1、2、5、10、20、50 mmol/L的亚硫酸氢钠，分析各浓度处理下构树叶片的光合参数、荧光参数以及叶绿素含量。结果表明，1 mmol/L的亚硫酸氢钠处理可以显著提高植株的净光合速率（P_N）、气孔导度（G_s）和光呼吸速率（R_p）；5 mmol/L的亚硫酸氢钠处理下叶绿素含量显著下降，而在超过20 mmol/L的亚硫酸氢钠处理下，植株的P_N、G_s、R_p、暗呼速率、叶绿素含量、实际光化学量子产量以及电子传递速率均较对照组显著下降，初始荧光、调节性能量耗散的量子产额和光呼吸份额则显著增加。这些结果说明，低浓度的亚硫酸氢钠在光呼吸所占份额基本不变的条件下，同时提高了净光合速率和光呼吸速率，而高浓度的亚硫酸氢钠则会对植物造成胁迫，导致光呼吸份额的增加，较高比例的光呼吸消耗光合产物，净光合速率降低。

英文摘要:

Sodium bisulfite (NaHSO₃) is a widely used photosynthetic promoter, which has a certain promoting effect on crop yield. However, if NaHSO₃ exceeds a certain dose, it may cause excessive sulfur content in crops and soil, which will cause great harm to human and agricultural ecological environment. In this study, Broussonetia papyrifera were used as experimental materials and seven NaHSO₃ concentration gradients (i.e., 0, 1, 2, 5, 10, 20, 50 mmol/L) were simultaneously sprayed on the leaf surface of different seedlings separately. The photosynthetic parameters, fluorescence parameters and chlorophyll content of the leaves under different concentrations were analyzed. The results showed that the 1 mmol/L NaHSO₃ treatment was clearly conducive to the net photosynthetic rate (P_N), stomatal conductance (G_s) and photorespiration rate (R_p). Chlorophyll content decreased significantly under 5 mmol/L NaHSO₃ treatment. Under the treatment of NaHSO₃ exceeding 20 mmol/L, the P_N, G_s, dark respiration rate (R_d), photorespiration rate (R_p), chlorophyll content, actual photochemical quantum yield (Y_Ⅱ) and electron transport rate (ETR) showed significant decreases, while the initial fluorescence (F_o), quantum yield of regulated energy dissipation (Y_NPQ) and photorespiration portion (S_p) significantly increased. These results indicate that low concentrations of NaHSO₃ increases the P_N and R_p under the condition that S_p is basically unchanged, while high concentration of NaHSO₃ can cause stress to plants, resulting in a decrease in photorespiration share. A higher proportion of S_p consumes photosynthetic products, and the P_N decreases.

查看全文查看/发表评论下载PDF阅读器

关闭