Effects of Grafting on Photosynthetic Characteristics and Mineral Elements of Melon Seedlings under Copper Stress

doi:10.7668/hbnxb.2014.05.032

Abstract

Abstract: The effects of grafting on photosynthetic characteristics and mineral elements of melon seedlings under copper stress in this study.Pumpkin Jingxinzhen NO.3 was carried out as stock,melon IVF09 and muskmelon IVF117 as cion,and ungrafted seedlings as control.Here,we found that,under copper stress,the biomass of melon seedlings was decreased,photosynthetic characteristics was inhibited and the absorption of mineral elements balance were destructed.But under the same stress conditions,the biomass and photosyntheic pigment content of grafted seedings were greater than that of ungrafted seedings.The net photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductance(Gs)and intercellular CO₂ concentration(Ci)were significantly higher than that of ungrafted seedlings,but Ls was lower.Grafting to improve the absorption of mineral elements,effectively increase the content of K,P,Na,reduce the content of Cu,Cu content of IVF09 grafting seedlings in leaf was significantly lower than that ungrafted seedlings under the 800 μmol/L Cu²⁺ stress,since only that in 70.11%,the IVF117 grafting seedlings was significantly lower than that of ungrafted seedlings under 400 μmol/L Cu²⁺ stress,since 86.61%.The test results showed that the grafting reduced photosynthetic characteristics and mineral elements absorption inhibitory effect on melon seedlings under copper stress,relieve the toxic effect on copper stress of melon seedlings.

Key words: Melon, Grafting, Copper stress, Photosynthetic characteristics, Mineral elements

CLC Number:

S652.01

TAN Ming-ming, HE Zhong-qun, ZHENG Wan-gang. Effects of Grafting on Photosynthetic Characteristics and Mineral Elements of Melon Seedlings under Copper Stress[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2014, 29(5): 186-192. doi: 10.7668/hbnxb.2014.05.032.

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