Zinc and a-Ketoglutaric Acid Modulates Plant Growth, Gas Exchange Attributes, Chlorophyll Fluorescence and Zn Content in Rice. | International Journal of Agriculture and Biology 2020

Xuwei Liu College of Agriculture, South China Agricultural University,Guangzhou, 510642, Guangdong,China

Zhuoli Huang College of Agriculture, South China Agricultural University,Guangzhou, 510642, Guangdong,China

Pingshan Fan College of Agriculture, South China Agricultural University,Guangzhou, 510642, Guangdong,ChinaHainan Key Laboratory for Sustainable Utilization of Tropical Bio-resources, Institute of Tropical Agriculture and Forestry, Hainan University,570228, Haikou,China

Long Zhang College of Agriculture, South China Agricultural University,Guangzhou, 510642, Guangdong,China

Yangfan Yan College of Agriculture, South China Agricultural University,Guangzhou, 510642, Guangdong,China

Yihan Yang College of Agriculture, South China Agricultural University,Guangzhou, 510642, Guangdong,China

Xinhang Wei College of Agriculture, South China Agricultural University,Guangzhou, 510642, Guangdong,China

Zhaowen Mo College of Agriculture, South China Agricultural University, Guangzhou, 510642, Guangdong, China; Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture, P. R. China, Guangzhou, 510642, Guangdong, China

The CO2 increment under climate change leads to adverse growth and quality such as decrease in Zn content of crops. The organic carbon nutrition such as a-ketoglutaric acid (A) is an important carbon source for crops contributing to better crop growth and Zn content in plant. Zn fertilization enhanced its absorption and assimilation resulting in better crop growth. However, the effect of a-ketoglutaric acid and Zn in regulating of its content in rice plant, on growth, photosynthetic attributes and chlorophyll fluorescence are still limited. A pot experiment was conducted by using two aromatic rice cultivars, Meixiangzhan 2 and Yuxiangyouzhan. The rice plants at 3 leaf stage were subjected to two Zn levels (Zn-; 0 mg·kg-1 and Zn+;10 mg·kg-1) and two a-ketoglutaric acid levels (A-; 0 mg·L-1 and A+; 50 mg·L-1). The results demonstrated strong Zn and a-ketoglutaric acid interactive effect on the plant Zn content and root dry weight. The highest Zn content in plant for Meixiangzhan 2 (19.59 µg·g-1) and Yuxiangyouzhan (25.75 µg·g-1) was observed under Zn-A+ treatment, followed by Zn+A-, Zn+A+ and Zn-A- treatments. The highest root dry weight was found under Zn+A+. Moreover, Zn and a-ketoglutaric acid application and the iteration of Zn and a-ketoglutaric acid strongly affected the chlorophyll fluorescence particularly at 1d, and regulated the photosynthetic parameters. The relationships between the Zn content in plant and the investigated parameters have been also accessed, with Zn content increased, plant height, photosynthetic attributes and chlorophyll fluorescence were improved. The Zn and a-ketoglutaric acid could regulate the Zn content in rice plant which was associated with the modulation of the plant growth, photosynthetic attributes and chlorophyll fluorescence.