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CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2020, Vol. 42 ›› Issue (6): 1026-.doi: 10.19802/j.issn.1007-9084.2020229

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Alleviating effect of partial rootzone drying on xerophytophysiological responses in peanut plants under drought stress

  

  1. Shandong Peanut Research Institute, Qingdao 266100, China
  • Online:2020-12-28 Published:2020-11-19

Abstract: A stimulus of partial rootzone drying (PRD) to plant roots can induce xerophytophysiological responses,
and improve drought resistance and the defense ability under subsequent drought stress. Shelve (P1), double
container (P2) and vanseline (P3) were set to separate the peanut roots into two rootzones before PRD treatment.
Two rootzones were alternatively irrigated four times, one side of rootzone kept 40% of field capacity, the other normally
irrigated with 75% of field capacity. Some physiological indexes of peanut xerophytic reaction induced by
PRD were studied. The results showed that PRD treatments increased root/shoot ratio, accumulated cytosol solutes
actively with ΔCFT value of P1, P2 and P3 treatments at 43.1, 65.1 and 49.6 osmol m-3 respectively. Water potential
and osmotic potential reduced and turgor potenial increased significantly. O2·-content increased by 2-3 times and
SOD activity increased significantly and remained high after rewatering. PRD shortened stomatal closing time of detached
leaves with prolonged water evaporation time, improved leaf photosynthesis after rewatering, and Gdi-15
gene expression in leaves and roots was induced by 2 to 7 times. Further experiment was designed to study the effect
of pre-PRD treatment on subsequent drought stress, 3 treatments were normal irrigation with 75% of field capacity
(Control), drought stress with 35% of field capacity (D) and subsequent drought stress with pre-PRD treatment (DP).
Compared with D treatment, leaf relative water content in DP treatment increased from 51.68% to 61.07%. Proline
accumulation in DP treatment reduced to 2104.50 μg∙g-1FW compared with 4328.72μg∙g-1FW in D treatment, pre-
PRD priming decreased MDA and O2·-content, meanwhile POD activity decreased from 592.46 to 217.68U∙g-1FW.
In conclusion, all three ways of PRD treatment induced xerophytophysiological regulation of which PRD treatment
used by vanseline was the best. Pre-PRD treatment could acclimate the plants to drought, so that the plants showed
rapid physiological defense and recovery ability when sensing drought stress again.

Key words:  , peanut;xerophytophysiology;partial rootzone drying

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