LI Jia-ru,SU Chun-jie,HU Xiao-hui.Effects of Exogenous γ-Aminobutyric Acid on Muskmelon Photosynthesis Under Salinity-alkalinity Stress[J].HEILONGJIANG AGRICULTURAL SCIENCES,2016,(09):66-71.[doi:10.11942/j.issn1002-2767.2016.09.0066]
外源γ-氨基丁酸对盐碱胁迫下甜瓜幼苗光合作用影响
- Title:
- Effects of Exogenous γ-Aminobutyric Acid on Muskmelon Photosynthesis Under Salinity-alkalinity Stress
- 文章编号:
- 1002-2767（2016）09-0066-06
- 分类号:
- S652
- 文献标志码:
- A
- 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CO-2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（P<0.05），而非光化学猝灭系数（NPQ）、气孔限制值（Ls）显著升高（P<0.05）；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（P<0.05），降低NPQ、Ls（P<0.05）。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。
- Abstract:
- In order to explore the effect of exogenous spraying γ-aminobutyric acid on the growth and development 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∶Na2SO4∶NaHCO3∶Na2CO3 = 1∶9∶9∶1) hydroponics was investigated.The results showed that salinity-alkalinity stress significantly reduced melon seeding the dry matter accumulation,chlorophyll content,net photosynthetic rate (Pn),stomatal conductance (Gs),transpiration rate (Tr),intercellular CO2 concentration (Ci),maximal photochemical efficiency of PSII (Fv/Fm),photosynthetic electron transport rate (ETR),actual quantum efficiency(ФPSII) and photochemical quenching coefficient (qP),and improved the non-photochemical quenching coefficient (qN) and stomatal limitation value (Ls).Spraying GABA could improve the dry matter accumulation,chlorophyll content,Pn,Gs,Tr,Ci,Fv/Fm,ETR,ФPSII,qP and reduced NPQ and Ls. Therefore,spraying GABA could reduce the adverse effects caused by salinity-alkalinity stress,improve the photosynthetic capacity and increase the plant dry matter accumulation of melon seeding.
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备注/Memo
收稿日期：2016-07-12