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外源γ-氨基丁酸对盐碱胁迫下甜瓜幼苗光合作用影响
引用本文:李嘉儒,苏春杰,胡晓辉.外源γ-氨基丁酸对盐碱胁迫下甜瓜幼苗光合作用影响[J].黑龙江农业科学,2016(9):66-71.
作者姓名:李嘉儒  苏春杰  胡晓辉
作者单位:1. 西北农林科技大学附属中学,陕西 杨凌,712100;2. 西北农林科技大学园艺学院,陕西 杨凌,712100
摘    要:为了探讨外源γ-氨基丁酸对盐胁迫下甜瓜的生长发育的影响,以甜瓜品种一品天下208为材料,采用水培法研究了外源γ-氨基丁酸(GABA)对盐碱胁迫下甜瓜幼苗的干物质积累、叶绿素含量、光合参数以及叶绿素荧光参数的影响。结果表明:盐碱胁迫下甜瓜幼苗的干物质积累量、叶绿素含量、净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)、胞间CO2浓度(Ci)、PSII的最大光化学效率(Fv/Fm)、光合电子传递速率(ETR)、PSII的实际量子效率(ФPSII)、光化学猝灭系数(qP)显著降低(P0.05),而非光化学猝灭系数(NPQ)、气孔限制值(Ls)显著升高(P0.05);叶面喷施外源γ-氨基丁酸(GABA)可显著提高盐胁迫下甜瓜幼苗的干物质积累、叶绿素含量、Pn、Gs、Tr、Ci、Fv/Fm、ETR、ФPSII、qP(P0.05),降低NPQ、Ls(P0.05)。研究表明外源GABA可提高盐碱胁迫下甜瓜幼苗叶片的光合能力,增加植株的干物质积累,有效地缓解盐碱胁迫对甜瓜幼苗生长的抑制作用。

关 键 词:甜瓜  γ-氨基丁酸  光合作用  干物质积累

Effects of Exogenous γ-Aminobutyric Acid on Muskmelon Photosynthesis Under Salinity-alkalinity Stress
Abstract:In order to explore the effect of exogenous spraying γ‐aminobutyric acid on the grow th and develop‐ment of melon under salt stress ,the effect of exogenous spraying γ‐aminobutyric acid (GABA 50 mmol·L‐1 ) on dry matter accumulation ,chlorophyll content ,photosynthetic and chlorophyll fluorescence parameters of melon(Yipintianxia 208) seeding under 50 mmol· L‐1 salinity‐alkalinity stress (NaCl∶Na2 SO4∶NaHCO3∶Na2CO3 = 1∶9∶9∶1) hydroponics was investigated .The results showed that salinity‐alkalinity stress signifi‐cantly reduced melon seeding the dry matter accumulation ,chlorophyll content ,net photosynthetic rate (Pn) , stomatal conductance (Gs) ,transpiration rate (Tr) ,intercellular CO2 concentration (Ci) ,maximal photochemi‐cal efficiency of PSII ( Fv/Fm ) , photosynthetic electron transport rate ( ETR ) , actual quantum efficiency (ФPSII) and photochemical quenching coefficient (qP) ,and improved the non‐photochemical quench‐ing coefficient (qN) and stomatal limitation value (Ls) .Spraying GABA could improve the dry matter accumu‐lation ,chlorophyll content ,Pn ,Gs ,Tr ,Ci ,Fv/Fm ,ETR ,ФPSII ,qP and reduced NPQ and Ls .Therefore ,spra‐ying GABA could reduce the adverse effects caused by salinity‐alkalinity stress ,improve the photosynthetic ca‐pacity and increase the plant dry matter accumulation of melon seeding .
Keywords:muskmelon  spermidine  γ-aminobutyric acid  photosynthesis  dry matter accumulation
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