|Table of Contents|

Effects of Drought Stress on Physiological Characteristics of Malus ‘Jimei’

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2020年12
Page:
82-88
Research Field:
Publishing date:

Info

Title:
Effects of Drought Stress on Physiological Characteristics of Malus ‘Jimei’
Author(s):
SUN XiaogangZHANG XueGU NaQU ShuangLIU Xiaojia
(College of Horticulture,Jilin Agricultural University,Changchun,Jilin 130118)
Keywords:
Malus ‘Jimei’drought stresswater potentialphotosynthetic parametersenzyme
PACS:
-
DOI:
10.11937/bfyy.20192812
Abstract:
The grafted seedlings of Malus ‘Jimei’ were used as experimental materials,and four treatment groups including control (CK),slight drought (SD),moderate drought (MD) and heavy drought (HD) were carried out in the pot experiment.The physiological characteristics of Malus ‘Jimei’ plants under different drought stress conditions were studied,in order to provide reference for the adaptive promotion of Malus ‘Jimei’.The results showed that with the decrease of soil relative water content and the extension of drought stress time,the leaf water potential and relative water content (RWC) of Malus ‘Jimei’ decreased gradually.Stomatal conductance (Gs),transpiration rate (Tr) and net photosynthetic rate (Pn) decreased with the destruction of photosynthetic system,stomatal closure,and intercellular CO2 concentration (Ci) increased.Among them,non-stomatal factors caused the decrease of Pn.Maximal photochemical efficiency (Fv/Fm),the actual light energy conversion (ΦPSⅡ) and light chemical quenching coefficient (qP) values fell,the PSⅡ destruction;The activity of protective enzymes SOD and POD increased slightly in the early stage of treatment,but decreased with the decrease of soil relative water content and the increase of treatment time,and the protective enzyme function was lost.In conclusion,Malus ‘Jimei’ had certain drought-resistant ability and could adapt to the environment with soil relative water content ranging from 55%-65%.Short term slight drought stress and short term moderate drought stress were allowed under the suitable light and temperature conditions of Malus ‘Jimei’.When the relative soil water content was less than 45%,water should be replenishment in time to avoid the impact of continuous severe drought stress.Artificial irrigation measures should be provided when necessary.

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Last Update: 2020-08-25