Effects of DTA-6 seed soaking on morphological and leaf physiological characteristics in proso millet at seedling stage

doi:10.11686/cyxb2018056

Abstract

Abstract: The aim of this research was to define the effect of diethyl aminoethyl hexanoate (DTA-6) seed soaking on morphology and leaf physiological characteristics in proso millet (Panicum miliaceum) at the seedling growth stage. Nianfeng 5 proso millet was the variety chosen for study, and seedling growth, leaf area per plant, leaf photosynthetic characteristics and carbohydrate accumulation of seedling plants were measured following seed soaking at different DTA-6 concentrations (0 [CK], 10, 50, or 250 mg·L^-1). It was found that DTA-6 enhanced seedling growth. Plant height, leaf dry weight, stem dry weight, and root dry weight under 250 mg·L^-1 DTA-6 treatment were, respectively increased by 55.73%, 277.99%, 162.88%, 123.55% compared to CK plants, while stem diameter was highest (54.18%>CK) in the 50 mg·L^-1 DTA-6 treatment, and the root:shoot ratio was highest (20.55%>CK) in the 10 mg·L^-1 DTA-6 treatment. DTA-6 significantly promoted leaf area per plant, leaf net photosynthetic rate and stomatal conductance, intercellular CO₂ concentration, but not leaf transpiration rate. Leaf area per plant, leaf stomatal conductance, and intercellular CO₂ were increased most in the 250 mg·L^-1 DTA-6 treatment, with values, respectively, 71.78%, 37.44% and 18.04% greater than CK, while net photosynthetic rate was highest in the 50 mg·L^-1 DTA-6 treatment. Carbohydrate levels of plants grown from seeds treated with DTA-6 showed different patterns compared to CK plants for different metabolites. DTA-6 reduced leaf soluble sugar content and fructose content, while sucrose content was increased to different degrees, but highest for the 50 mg·L^-1 DTA-6 treatment. In summary, DTA-6 seed soaking had marked effects on leaf photosynthetic characteristics, and improved leaf sucrose content, thereby enhancing the growth of proso millet plants. So, it is better to list the DTA-6 concentrations used the 50 mg·L^-1.

Key words: DTA-6 (diethyl aminoethyl hexanoate), proso millet, morphology, photosynthetic characteristics, carbohydrates accumulation

ZHANG Pan-pan, WANG Xiao-lin, GUO Ya-ning, YAN Jia-kun, FENG Bai-li, ZHANG Xiong. Effects of DTA-6 seed soaking on morphological and leaf physiological characteristics in proso millet at seedling stage[J]. Acta Prataculturae Sinica, 2018, 27(9): 77-84.

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