|Table of Contents|

Effect of Glyphosate on Photosynthesis Diurnal Variation of Glyphosate-resistant Soybean [Glycine max (L.) Merr.](PDF)

《大豆科学》[ISSN:1000-9841/CN:23-1227/S]

Issue:
2011年03期
Page:
419-423
Research Field:
Publishing date:

Info

Title:
Effect of Glyphosate on Photosynthesis Diurnal Variation of Glyphosate-resistant Soybean [Glycine max (L.) Merr.]
Author(s):
YUAN Xiang-yang GUO Ping-yi ZHANG Li-guang WANG Xin Lv Miao-miao ZHANG Hong-gangSONG Xi-e
Laboratory of Crop Chemical Regulation and Chemical Weed Control, Agronomy College, Shanxi Agricultural University,Taigu 030801, Shanxi, China
Keywords:
Glyphosate Glyphosate-resistant soybean Photosynthetic characteristics Diurnal variation
PACS:
S565.1
DOI:
10.11861/j.issn.1000-9841.2011.03.0419
Abstract:
Random complete block design was used to research the different dosages of glyphosate on diurnal variation of photosynthetic characteristics in leaves of glyphosate-resistant soybean (RR1) in the field. The results showed that: (1) The trend of diurnal variation of net photosynthetic rate (Pn), transpiration rate (Tr) and stomatal conductance (Gs) in RR1 leaves showed a single peak curve, the peak appeared at about 10∶00, 12∶00 and 10∶00, respectively. Chlorophyll content index (CCI) declined until 14∶00, then increased. The water use efficiency (WUE) and intercellular CO2 concentration (Ci) of RR1 changed like wave as time went on, WUE appeared three peaks at 6∶00, 10∶00 and 16∶00, respectively, while the highest Ci was appeared at 6∶00. (2) The trend of diurnal variation of photosynthetic characteristics in RR1 leaves treated with glyphosate was similar with the control. Pn and CCI decreased with increasing of glyphosate dosage, but only dropped significantly when glyphosate dose > 4.48 L·hm-2. Glyphosate dose at 1.12 L·hm-2 promoted Gs of RR1, while the others inhibited Tr and Gs before 12∶00 (including 12∶00). Glyphosate increased Tr and Gs of RR1 after 12∶00. Ci of RR1 increased with increasing of glyphosate dosage, and glyphosate > 2.24 L·hm-2 reduced WUE of RR1. Results suggest photosynthetic characteristics and chlorophyll content of RR1 leaves are affected by photosynthetic active radiation and glyphosate.

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Last Update: 2014-09-12