|Table of Contents|

Physiological Response to Drought Stress and Drought Tolerance Evaluation of Five North High-bush Blueberry Varieties(PDF)

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2016年24
Page:
10-14
Research Field:
Publishing date:

Info

Title:
Physiological Response to Drought Stress and Drought Tolerance Evaluation of Five North High-bush Blueberry Varieties
Author(s):
LI Genzhu1; ZHANG Zichuan1; ZHENG Yunpu2; LOU Xin1; WANG Hexin1; DING Xiaoyi3
(1.Institute of Modern Agricultural Research，Dalian University，Dalian，Liaoning 116622;2.School of Water Conservancy and Hydropower,Hebei University of Engineering,Handan,Hebei 056038；3.School of Investigation and Antiterrorism，People′s Public Security University of China，Beijing 102623)
Keywords:
North high-bush blueberry; drought stress; proline; POD; photosynthetic rate; chlorophyll fluorescence parameters
PACS:
-
DOI:
10.11937/bfyy.201624003
Abstract:
Five blueberry cultivars (‘Blue crop’‘Big bluegold’‘Duke’‘Carla’ and ‘Shuangdi’) were selected to control soil water content after growing in a greenhouse for 45 days to establish canopy.Three drought stress levels (mild drought stress，moderate drought stress，and severe drought stress) were set up by measuring soil water contents after the 25th (Ψ=(-0.10±0.011)MPa)，35th (Ψ=(-1.98±0.17)MPa) and 45th day (Ψ=(-2.97±0.18)MPa)，respectively.The control pots were watered once about 10 days (Ψ=(-0.03±0.003)MPa).The leaf relative water content，conductivity，proline content and peroxidase (POD)，photosynthetic rate and chlorophyll fluorescence parameters were measured and meanwhile the anti-drought ability of the five varieties was evaluated with the membership function methods.The results showed that the leaf relative water content of the blueberry cultivars gradually decreased with the strengthening of drought stress and the leaves of the five varieties were significant water loss under severe drought，but ‘Duke’ and ‘Big bluegold’ were better than the other three varieties.The leaf conductance did not increased significantly under moderate drought，but was rising significantly under severe stress，the order was ‘Shuangdi’>‘Carla’>‘Big bluegold’>‘Duke’>‘Blue crop’.Meanwhile，the proline content was also enhanced with the increased drought stress，and obviously increased in moderate and severe drought (‘Carla’>‘Shuangdi’>‘Blue crop’>‘Duke’>‘Big bluegold’).However，the activity of POD activity shared a ‘bell’ ship curve with the increases of drought stress.There were significant differences among the POD activity of the five blueberry varieties，and severe stress between different varieties under the difference became smaller.The order of the POD activity change was ‘Duke’>‘Shuangdi’>‘Carla’>‘Blue crop’>‘Big bluegold’.The photosynthetic rates of the five blueberry varieties were significantly decreased with the intensity of drought stress.The photosynthetic rate was significant different between the mild drought stress and control，and the photosynthetic rate under severe drought were significant differences with control and the mild drought stress.The leaf Fv/Fm had a smaller decline under mild and moderate stresses and significantly decreased in severe drought stress.The strength of drought resistance of the five blueberry varieties with membership function methods was ‘Duke’>‘Carla’>‘Blue crop’>‘Big bluegold’>‘Shuangdi’.

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Last Update: 2017-01-20