| Response of stomatal conductance and leaf water potential to water and nitrogen stress during grain\|filling period of hybrid seed maize in arid region of the northwestern China |
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| DOI：10.7606/j.issn.1000-7601.2020.04.32 |
| Key Words: water and nitrogen stress hybrid seed maize leaf water potential stomatal conductance stomatal characteristics |
| Author Name | Affiliation | | DEND Xin | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A＆F University, Yangling, Shaanxi 712100, China | | RAN Hui | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A＆F University, Yangling, Shaanxi 712100, China | | YU Tinggao | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A＆F University, Yangling, Shaanxi 712100, China | | PENG Xuelian | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A＆F University, Yangling, Shaanxi 712100, China | | JI Shasha | Center for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China | | HU Xiaotao | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A＆F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| To explore the physiological water\|saving mechanism of hybrid seed maize under the conditions ofwater and nitrogen stress in arid region of the northwestern China, the treatments including two irrigation rates, full (FI) and deficit irrigation (DI) combining with two nitrogen (N) rates, 150 kg·hm-2 (N150) and 0 kg·hm-2 (N0),were studied. The changes of leaf water potential and stomatal characteristics were measured. The results showed that N mainly improved stomatal conductance by increasing stomatal divergence degree and stomatal number under the condition of full irrigation, the stomatal divergence degree was increased by 19.46% and the stomatal number by 8.46% compared with no N treatments.For deficit irrigation, the water consumption was responded by increasing the number of open pores per unit area and decreasing the stomatal opening to improve drought resistancem, more stomatal with smaller opening per unit area were found to cope with water loss and improve drought resistance, the stomatal divergence degree of deficit irrigation decreased by 21.38% and the stomatal number increased by 14.08% on average compared with full irrigation. The stomatal divergence degree was significantly increased (P<0.01) and leaf water potential dawn and midday leaf water potential of maize leaves was increased with the increase of irrigation amount, which promoted crop transpiration. Compared with DIN150 treatment, the mean water potential of dawn and midday leaves in FIN150 treatment increased by 3.30% and 2.00%, respectively. Compared with DIN0 treatment, the mean water potential of dawn and midday leaves in FIN0 treatment increased by 13.41% and 14.29%, respectively.Nitrogen-treated dawn and midday leaf water potential means increased by 2.87% and 0.17% under deficit irrigation condition, respectively. The stomatal divergence degree,and leaf water potential before dawn and midday of maize leaves were significantly increased with increasing irrigation amount, which promoted crop transpiration. Nitrogen application helped increasing leaf water potential before dawn and midday under deficit irrigation condition.The decrease in the stomatal conductance and the midday leaf water potential caused by drought was partially compensated by increasing N rate. |
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