Effects of Cool and Cold Conditions on Nitrogen Uptake Kinetics in Malus baccata Borkh. Seedlings

ACTA HORTICULTURAE SINICA ›› 2010, Vol. 37 ›› Issue (9): 1493-1498.

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Effects of Cool and Cold Conditions on Nitrogen Uptake Kinetics in Malus baccata Borkh. Seedlings

Lü De-guo*，WANG Ying，QIN Si-jun，MA Huai-yu，LIU Guo-cheng，DU Guo-dong，and MENG Qian

（College of Horticulture，Shenyang Agricultural University，Research Laboratory for Breeding and Physiology-ecology of Northern Fruit Tree，Shenyang 110866，China）

Received:2010-03-01 Revised:2010-05-18 Online:2010-09-25 Published:2010-09-25
Contact: Lü De-guo

Abstract

Abstract:

The method of conventional exhaustion and improved exhaustion was carried out to study the kinetics characteristics of nitrogen absorption in root of Malus baccata Borkh. seedlings in cool and cold conditions. The characteristics of nitrogen absorption kinetics were affected by cool and cold condition. In normal temperature（25 ℃）the affinity of NO3- was greater than that of NH4+ which indicated that root had the priority to absorb NO3-. But in cool and cold condition（10 ℃）the affinity of NH4+ was greater than that of NO3-，and in this moment the root had the priority to absorb NH4+. The M. baccata Borkh. seedlings’ absorption was decreased in cool and cold condition and it was indicated that the maximum absorption velocity，nutrient inflow velocity and affinity of NO3- and NH4+ were decreased in cool and cold condition. The influence of cool and cold condition in absorbing NO3- was greater than absorbing NH4+.

Key words: Malus baccata Borkh., cool and cold condition, nitrogen, uptake kinetics

CLC Number:

S 661

Lü De-guo;WANG Ying;QIN Si-jun;MA Huai-yu;LIU Guo-cheng;DU Guo-dong;and MENG Qian. Effects of Cool and Cold Conditions on Nitrogen Uptake Kinetics in Malus baccata Borkh. Seedlings[J]. ACTA HORTICULTURAE SINICA, 2010, 37(9): 1493-1498.

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Effects of Cool and Cold Conditions on Nitrogen Uptake Kinetics in Malus baccata Borkh. Seedlings

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