Tree Morphology,Accumulation and Distribution Characteristics of Mineral Nutrient in Root System of Gala Apple Young Tree with Different Dwarfing Interstocks

doi:10.7668/hbnxb.2016.04.029

Abstract

Abstract: In this study,we aimed to identify the differences of tree morphology,accumulation and distribution characteristics of mineral nutrient in root system of Gala apple young tree with different dwarfing interstocks.The results were expected to reveal the relations between the tree dwarfing ability and accumulation,distribution of mineral nutrient in root system.Gala apple saplings (in pots) grafted onto dwarfing interstocks (GM256,Liaozhen No.2,SH1,SH6,SH38,and SH40) with uniform growth vigour were used as the experimental material.After spring shoot growth stopped,plant height and cross-sectional area were measured.The root morphology indexes were analyzed by WINRhizo analysis software.For the measurement of mineral nutrient contents,healthy plants at the same growth stage were removed from the pots,and were dissected and separated into different diameter root system.The contents and accumulations of mineral nutrient were determined.The results showed that plant height and cross-sectional area of Gala apple trees grafted onto dwarfing interstocks were obviously lower than that of the control.The degree of dwarfing of the interstocks followed the order of SH38 > SH1 > SH6 > GM256 > SH40 > Liaozhen No.2.Differences in mineral nutrient contents in different diameter root system of Gala apple young tree among different dwarfing interstocks were obviously different.The mineral nutrient contents in<0.5 mm diameter root system were highest,and the mineral nutrient contents decreased with the increase of root system diameter.The contents of K and Mg of Gala apple root system for SH38 were highest.Root system for SH1 interstocks had the highest Cu,Fe and Zn contents.The accumulations of P,Ca,Fe in all parts of GM256 interstocks root system and that of K,Mg and Zn in>3 mm diameter root system were higher than control and other treatments.The accumulations of K,Mg and Zn in<3 mm diameter root system for Liaozhen No.2 were highest.The mineral nutrient accumulations of SH38,SH1 and SH6 with weak growth vigour were lower than that of Liaozhen No.2,GM256 and CK with strong growth vigour.The optimal interstocks for Gala apple with better dwarfing effect were SH38,SH1 and SH6.In practical application,site condition,soil supplying nutrient capability and nutrient requirement characteristics of different stock-scion combinations should be fully considered,which for realizing the high quality and high efficiency production of apple.

Key words: Gala apple, Dwarfing interstock, Root system morphology, Mineral nutrient accumulation

CLC Number:

S143

ZHAO Deying, YUAN Jicun, XU Kai, CHENG Cungang, YAN Shuai. Tree Morphology,Accumulation and Distribution Characteristics of Mineral Nutrient in Root System of Gala Apple Young Tree with Different Dwarfing Interstocks[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2016, 31(4): 184-191. doi: 10.7668/hbnxb.2016.04.029.

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