A study of the photosynthetic physiology of different forage triticale genotypes

doi:10.11686/cyxb2019339

Abstract

Abstract: The aim of this research was to identify forage triticale genotypes with strong photosynthetic performance and elucidate the main factors influencing photosynthetic performance. The chlorophyll content and photosynthetic physiological index of 6 forage triticale genotypes were studied at different growth stages, and data analysed by analysis of variance and principal component analysis. It was found that parameters related to photosynthesis (except for stomatal limitation value) peaked during early development and then declined with advancing maturity. Values for chlorophyll content, transpiration rate, photosynthetic rate and intercellular CO₂ concentration peaked at the heading stage, while water use efficiency peaked at the flowering stage. The time trend for stomatal limitation value was opposite to that of other traits with the lowest value observed at the heading stage. The principal component analysis revealed that transpiration rate and stomatal traits most influenced the photosynthetic performance of forage triticale. Both C31 and C19 had relatively strong photosynthetic performance during the entire development cycle and were high-yielding. However, C19 showed an advantage of relatively high water use efficiency. This line can therefore be further used as a germplasm resource for drought resistance. The principal component analysis showed that transpiration rate and stomatal related factors had significant influence on the photosynthetic performance of forage triticale.

Key words: triticale, genotypes, growth stages, photosynthetic physiology

ZHAO Fang-yuan, LIU Jing, DU Wen-hua, TIAN Xin-hui. A study of the photosynthetic physiology of different forage triticale genotypes[J]. Acta Prataculturae Sinica, 2020, 29(1): 63-73.

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