|Table of Contents|

Influence of Different Defoliation Rates at Different Growth Stages to Agronomic and Quality Traits of Soybean Cultivar NN99-6(PDF)

《大豆科学》[ISSN:1000-9841/CN:23-1227/S]

Issue:
2018年05期
Page:
715-722
Research Field:
Publishing date:

Info

Title:
Influence of Different Defoliation Rates at Different Growth Stages to Agronomic and Quality Traits of Soybean Cultivar NN99-6
Author(s):
LI Jian-qiao; ZHANG Feng-kai;  XING Guang-nan;  GAI Jun-yi
(Soybean Research Institute of Nanjing Agricultural University/ National Center for Soybean Improvement/ Key Laboratory for Biology and Genetic Improvement of Soybean (General), Ministry of Agriculture/ National Key Laboratory for Crop Genetic and Germplasm Enhancement/ Jiangsu Collaborative Innovation Center for Modern Crop Production, Nanjing 210095, China)
Keywords:
Soybean;  Leaf feeding insect;  Defoliation rate;  Growth stage;  Agronomic traits;  Seed quality traits
PACS:
-
DOI:
10.11861/j.issn.1000-9841.2018.05.0715
Abstract:
To provide a reference for evaluating soybean tolerance against leaf-feeding insects and formulating pest control indicators, indicators and periods sensitive to mechanical loss of the blade are screened. The effects of different defoliation rates (0%, 16.7%, 33.3%, 50.0%, 66.7%, 83.3% and 100%) at different growth stages (V5, R1, R3, R5) on soybean cultivar NN99-6 were evaluated to explore their influences to agronomic and quality traits. (i) Highly significant differences were found among different defoliation rates for pod number per plant, seed yield per plant, plant height and for number of two-, three- and four-seed pods, significant differences were found for number of nodes on main stem, number of one-seed pods and 100-seed weight, while there were no significant differences among effective branch number, seeds number per pod, protein and oil content. The number of one-, two-, three- and four-seed pods decreased gradually along with the increase of defoliation rates. (ii) On average, a 33.3% and above defoliation could lead to a significant reduction in pod number per plant, a 50% and above defoliation could lead to a significant decrease in seed yield per plant, while a 100% defoliation could result in a significant decrease in 100-seed weight. (iii) Among different defoliation stages, there showed significant or approximately significant differences for 100-seed weight, three-seed pod number, pod number per plant and seed yield per plant, while no significant difference was found for other traits. Defoliation at beginning podding stage (R3) caused greatest influences on pod number per plant. While defoliation at the beginning of seed development stage (R5) caused the greatest influence on 100-seed weight and significant influenced on pod number per plant. Therefore, R3 and R5 were critical periods of leaf loss. (iv) The interactions between defoliation stages and defoliation rates showed a little influence on agronomic and quality traits, and did not reach a significant level. (v) This experiment simulated the mechanical damage of soybeans caused by leaf-chewing insects, but did not involve the effects due to saliva poisoning through feeding and sucking by phloem-sucking insects. (vi) It is suggested that 33.3% defoliation rate can be used to simulate damage of leaf-chewing insects at R3 stage which is a critical period for leaf-feeder damages, and the loss rate of pod number per plant, 100-seed weight and seed yield per plant can be used as indicators of tolerance to leaf-feeding insects.

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Last Update: 2018-10-08