Affiliation:
1. Institute of Crop Sciences, Key Laboratory of Crop Physiology and Ecology, Chinese Academy of Agricultural Sciences, Ministry of Agriculture and Rural Affairs, Beijing 100081, China
2. College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
Abstract
Understanding the water status of specific organs can be helpful in evaluating the life activities and growth conditions of maize. To accurately judge organ growth conditions and thus design appropriate interventions, it is necessary to clarify the true water dynamics of each maize organ. Using multiple maize cultivars with different growth periods, spatio-temporal water dynamics were analyzed here in the leaves, stalks, and ear components. Leaf water content was found to gradually decrease from both the bottom and top of the plant to the middle, whereas stalk water content decreased sequentially from the top to the bottom. Each successively higher node from the bottom of the plant was associated with decreases of 0.99% and 1.27% water content in the leaves and stalks, respectively. The water dynamics in leaves and internodes showed three clear stages: the slow loss, rapid loss, and balance stage. A water content of 60% appeared to be an irreversible turning point for initiation of senescence. Using normalized growth period as a measure, each of the tested cultivars could be assigned into one of two types based on their water dynamics: stay-water or general type. General-type cultivars had a shorter duration with a high water content and a water loss rate approximately twice as high as that of the stay-water type. This may have been related to the leaf senescence characteristics. However, the stay-water trait did not interfere with water dynamics of the ear components. Therefore, it may not be robust to evaluate the kernel dehydration of maize according to leaf senescence conditions due to the weak correlation between kernel water content and leaf senescence characteristics.
Funder
National Natural Science Foundation of China
Earmarked Fund for Modern Agro-industry Technology Research System in China
Agricultural Science and Technology Innovation Program
Subject
Plant Science,Ecology,Ecology, Evolution, Behavior and Systematics
Reference46 articles.
1. Nobel, P.S. (2009). Physicochemical and Environmental Plant Physiology, Elsevier Inc.
2. Crops that feed the world 6. Past successes and future challenges to the role played by maize in global food security;Shiferaw;Food Secur.,2011
3. Remote sensing of plant-water relations: An overview and future perspectives;Damm;J. Plant Physiol.,2018
4. Nobel, P.S. (2009). Physicochemical and Environmental Plant Physiology, Elsevier Inc.
5. Canopy leaf water content estimated using terrestrial LiDAR;Zhu;Agric. For. Meteorol.,2017