Journal
FRONTIERS IN PLANT SCIENCE
Volume 12, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fpls.2021.693815
Keywords
cultivated rice (Oryza sativa L; ); leaf gas exchange; stomatal conductance; leaf hydraulics; leaf vein density
Categories
Funding
- National Natural Science Foundation of China
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The study found that leaf vein density, especially minor vein density, plays a crucial role in leaf water exchange and photosynthesis in rice plants, while the ratio of minor vein length to total vein length does not have a significant impact on leaf hydraulics and gas exchange.
Six cultivated rice genotypes showing different stomatal conductance (g(s)) values were used to investigate the influence of leaf vein traits on leaf gas exchange and leaf hydraulics. The results showed that g(s) was the main determinant of the varietal difference in the net photosynthetic rate (P-N), whereas the area-based leaf nitrogen content (N-area) and mesophyll conductance (g(m)) were not main factors. g(s) and P-N were both positively correlated with leaf hydraulic conductance (K-leaf). A high density of leaf veins (vein length per leaf area, VLA), especially minor leaf veins (VLA(minor)), was of benefit for improving the K-leaf. The proportion of the minor leaf vein length to the total leaf vein length did not impact the leaf hydraulics or leaf gas exchange. Overall, these findings suggested that a high density of leaf veins, especially minor leaf veins, enhances K-leaf and promotes g(s) and P-N in cultivated rice genotypes and a high VLA can be regarded as a high photosynthetic capacity trait in rice plants.
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