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Effects of low nocturnal temperature on photosynthetic characteristics and chloroplast ultrastructure of winter rapeseed
2017-04-11 16:01   审核人:

Russian Journal of Plant Physiology

July 2016, Volume 63, Issue 4, pp 451–460

Z. G. Liu Email author  W. C. Sun Y. N. Zhao X. C. Li Y. Fang  J. Y. Wu  X. C. Zeng  N. N. Yang  Y. Wang  L. He  Z. G. Liu1

W. C. Sun1  Y. N. Zhao1  X. C. Li1  Y. Fang1  J. Y. Wu1  X. C. Zeng1  N. N. Yang1  Y. Wang1  L. He1

1.      Gansu Provincial Key Laboratory of Aridland Crop ScienceGansu Key Laboratory of Crop Improvement and Germplasm EnhancementLanzhouChina

Research Papers

First Online: 24 June 2016

Received:  14 August 2015

DOI: 10.1134/S1021443716040099

Cite this article as:

Liu, Z.G., Sun, W.C., Zhao, Y.N. et al. Russ J Plant Physiol (2016) 63: 451. doi:10.1134/S1021443716040099

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Abstract

We investigated the effects of low nocturnal temperature on photosynthetic apparatus of winter rapeseed (Brassica campestris L.). An artificial climate chamber was used to simulate the effects of low nocturnal temperature on seedling and stomatal morphology, chloroplast ultrastructure, photosynthetic parameters, and dry matter distribution and accumulation in two winter rapeseed cultivars, Longyou-7 (ultra coldresistant) and Tianyou-2 (weak cold resistance). Compared with those at diurnal/nocturnal temperatures of 20°/10°C (control), rapeseed seedlings at 20°/5°C had increased leaf chlorophyll content, deepened green leaf color, decreased stomatal conductance (Gs), intercellular CO2 concentration (Ci), and photosynthetic rate (Pn), and improved root/shoot ratio; the majority of stomata remained open in Longyou-7 while those in Tianyou-2 were mostly closed or semi-closed. At diurnal/nocturnal temperatures of 20°/–5°C, rapeseed seedlings had decreased leaf chlorophyll content with increased Ci but decreased Gs and Pn; Tianyou-2 exhibited ruptured chloroplast membrane, dissolved grana, broken stroma lamella, and decreased root/shoot ratio, whereas Longyou-7 had chloroplasts retaining partial structure of grana with a small amount of starch granules in guard cells. Low nocturnal temperature damaged the photosynthetic membrane of chloroplasts and reduced Pn in the leaves of winter rapeseed influencing photosynthetic processes in this crop. The reduction of Pn was mainly related to stomatal limitation at diurnal/nocturnal temperatures of 20°/5°C and non-stomatal limitation at diurnal/nocturnal temperatures of 20°/–5°C.

Keywords

Brassica campestris low temperature photosynthetic characteristics ultrastructure 

Abbreviations

DWdry weight

FWfresh weight

Gsstomatal conductance

Ciintercellular CO2 concentration

Pnphotosynthetic rate

Trtranspiration rate

PEPCphosphoenolpyruvate carboxylase

The article is published in the original.

 

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