|Table of Contents|

Effects of Exogenous Melatonin on the Growth Characteristics of Soybean During Seed-filling Period Under Drought Stress(PDF)

《大豆科学》[ISSN:1000-9841/CN:23-1227/S]

Issue:
2019年05期
Page:
747-753
Research Field:
Publishing date:

Info

Title:
Effects of Exogenous Melatonin on the Growth Characteristics of Soybean During Seed-filling Period Under Drought Stress
Author(s):
(Agronomy College of Heilongjiang Bayi Agricultural University, Daqing 163319, China)
Keywords:
Soybean (Glycine max L.);  Seed-filling period;  Drought stress;  Melatonin;  Photosynthetic products;  Yield
PACS:
-
DOI:
10.11861/j.issn.1000-9841.2019.05.0747
Abstract:
Seed-filling stage is the key growth period that determines the level of soybean yield. This experiment was conducted at the beginning of seed-filling in order to study the effects of drought stress and melatonin through comparing morphological indexes, yield and its components, photosynthetic parameters and carbon metabolic indicators. The results showed that drought stress caused a significant reduction in pod number per plant (9.04%), particle number per plant (6.21%), 100-seed weight (22.81%) and particle weight per plant (27.44%). With prolonged drought treatment, net photosynthetic rate (Pn), transpiration rate (Tr) and stomatal conductance (Gs) were significantly reduced, and intercellular CO2 concentration (Ci) was markedly increased. The levels of starch, sucrose, fructose and glucose were declined, and acid invertase, neutral invertase, sucrose phosphate synthase and sucrose synthase activities were restrained during drought stress treatment. Under normal and drought environments, melatonin pre-treatment caused a increase in pod number per plant, particle number per plant and yield because of photosynthetic parameters were improved. Melatonin pre-treatment caused a increase in yield under normal and drought (4.74% and 12.43%) environments. But melatonin treatment had no significant effect on carbohydrate contents and related enzyme activities. Under drought stress, melatonin pre-treatment increased carbohydrate contents and related enzyme activities. It indicates that melatonin can effectively alleviate the adverse effects of drought stress on plant growth and development.

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Last Update: 2019-09-20