The Effect of Air Humidity on the Stress Physiology of the Grafted Cucumber in High Temperature Plastic Tunnel under CO2Enrichment

doi:10.3969/j.issn.1000-7091.2012.03.026

Abstract

Abstract: The purpose was to study the effects of air humidity on stress physiology of the grafted cucumber in?high temperature in plastic tunnel under CO₂enrichment. With the cucumber variety Jinchun 4 as the tested material，the cucumber plants were made for 3 treatments of air humidity as (95 ±5)% (L₁)，(75 ±5)% (L₂)，(55 ±?5)%(L₃)in high temperature of 40 －45℃ under CO₂enrichment respectively. The result showed osmoregulation?substances had an increased tendency with the treating days;MDA of the treatment L₂and L₃was increased and L₁?was increased first and then decreased;cell membrane permeability of cucumber leaves of treatment L₂and L₃was?increased and L₁was decreased;the cell protective enzymes activities of L₁and L₂was all increased and L₃was increased first and then decreased with the treating day. It was revealed that the plants had self-adjust abilities of?stress tolerance. Proline content，MDA，the cell protective enzymes activities and cell membrane permeability of cucumber leaves had a decreased tendency respectively with the treating days and showed L₁﹤ L₂﹤ L₃. The soluble?protein of treatment L₁was decreased 17. 23% and 18. 61% respectively compared to L₂and L₃after treatment 24?d. The same situation was for proline content was decreased 51. 28% and 70. 72%;soluble sugar was decreased 24. 02% and 37. 21%;MDA was decreased 43. 44% and 55. 28%;cell membrane permeability of cucumber leaves?was decreased 74. 46% and 74. 46%;SOD activity was decreased 41. 88% and 38. 19%;CAT activity was decreased 61. 21% and 67. 35%;POD activity was decreased 27. 80% and 39. 45%. These results illustrated that the?grafted cucumber plants was protected from stress tolerance in higher air humidity (95 ±5)% with high temperature plastic tunnel under CO₂enrichment. The ability of resistance stress tolerance of grafted cucumber plants was?increased and hurt of plants was alleviated by stress tolerance under higher air humidity with high temperature under?CO₂enrichment.

Key words: CO₂, Air humidity, High temperature, Cucumber, Stress physiology

CLC Number:

S642.2

LIU Jie-cai, CUI Shi-mao, WU Yu-feng, Qi Rige, HUO Xiu-wen, YANG Wen-xiu, FU Chong-yi, WANG Yu-jing. The Effect of Air Humidity on the Stress Physiology of the Grafted Cucumber in High Temperature Plastic Tunnel under CO₂Enrichment[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2012, 27(3): 130-135. doi: 10.3969/j.issn.1000-7091.2012.03.026.

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