Studies on Photosynthetic Characteristics of Four Cold-resisting Rhizomatous Crops in Alpine-cold Regions of North China

doi:10.7668/hbnxb.2015.02.036

Abstract

Abstract: In order to clarify clod-resisting rhizomatous crops' photo-thermal ecological adaptation with highlight and low-temperature environment and provide theoretic basis for corp breeding and structure regulation.LI-6400 portable photosynthesis system was used to monitor the diurnal variations of the photosynthetic rate in different periods of radish, beets, kohlrabi, mustard in Alpine-cold North China.In Alpine-cold Regions of North China, the diurnal variation of net photosynthetic rate (Pn) of four cold-resisting root crops exhibited dual-peak curves in July and August, and the depression of Pn was mainly due to make thriftlessly use of water because of high temperature stress that led in incomplete stomatal closure and low photosynthetic activity of mesophyll cell.The diurnal variation of Pn mainly presented a single peak cure in September.All of them variation of diurnal photosynthetic capacity (DPC) and the variation of diurnal transpiration capacity (DTC) were in the order of August>July>September.The kohlrabi's both daily water use efficiency (WUEd) and diurnal variations of light utilization efficiency (LUE) were significantly higher than that of beet, mustard and radish lying in between.The after-frosting DPC of kohlrabi was 46.7% of its before-frosting, and the after-frosting DPC of mustard was 60.0% of its before-frosting.However, the after-frosting DPC of mustard increased by 9.22% comparing with that before frost.The kohlrabi and beet had potential of extending growth period and enlarging photosynthetic intensity and powerful adaptability of photo-thermal resource in Alpine-cold Regions of North China because of their temperature insensitivity.

Key words: Photosynthetic characteristics, Depression of net photosynthetic rate, Radish, Beet, Kohlrabi, Mustard

CLC Number:

S63.01

WANG Wei-jing, ZHANG Ji-zong, HAO Ya-xing, HAN Kai-hong, ZHANG Li-feng. Studies on Photosynthetic Characteristics of Four Cold-resisting Rhizomatous Crops in Alpine-cold Regions of North China[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2015, 30(2): 212-219. doi: 10.7668/hbnxb.2015.02.036.

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