doi:

DOI: 10.3724/SP.J.1006.2018.00288

Acta Agronomica Sinica (作物学报) 2018/44:2 PP.288-296

Effect of Low Temperature in Spring on Yield and Photosynthetic Characteristics of Wheat


Abstract:
Low temperature (LT) stress in spring occurs frequently in the Huang-Huai Rivers Valley, resulting in yield loss of wheat. The objectives of this study were to understand the physiological responses of wheat cultivars to LT and determine suitable physiological indicator(s) for cold-tolerance selection. Three cultivars, Taishan 6426, Taishan 4033, and Jimai 22, were exposed to LT stress at standing, jointing and booting stages, and the yield-related traits, photosynthetic parameters as well as leaf cell structure were compared among different cultivars. The agronomic traits of different cultivars changed in similar trends after LT treatment with the consistent result across years. Plant height received small influence of LT, especially LT at standing stage. In contrast, spike number per plant decreased significantly compared with the control (normal temperature), but the reduced percentage varied across years. Grain number per spike and yield per plant showed significantly declined trends with delaying LT stress, and the maximum decrements were observed in the treatment of LT at booting stage. The grain number per spike was 90.5%-93.3% (2012-2013) and 91.9%-93.6% (2013-2014) lower, and the yield per plant was 87.9%-97.3% (2012-2013) and 91.5%-97.8% (2013-2014) lower in LT treatment at booting than in the control. Booting stage was secondly sensitive to LT in yield, whereas jointing stage was less influenced by LT. Grain yield loss under LT stress mainly resulted from the decrease of grain number per spike. Under LT at jointing or booting stage, the chlorophyll content decreased in the three cultivars, but the decrement varied across cultivars. Moreover, the photosynthetic rate, transpiration rate and stomata conductance decreased significantly and the intercellular CO2 concentration increased greatly in the three cultivars, and those in Taishan 6426 had the minimum variations. LT also had inhibition in chlorophyll fluorescence parameters of wheat. For example, the Fv/Fm value was significantly lower in the treatment of LT at jointing or booting stage than in the control except for Taishan 6426. When exposed to LT stress, leaf epidermic cells were severely damaged, showing their loose arrangement and irregular structures of guard cell and accessory cell. Our results indicate that photosynthetic rate, transpiration rate, stomata conductance, intercellular CO2concentration and Fv/Fm can be used as indicators to identify tolerance of wheat cultivars to spring coldness.

Key words:wheat,low temperature,yield,photosynthetic and fluorescent parameters,cold resistance

ReleaseDate:2018-03-08 10:13:40



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