| Responses of leaf stomatal traits to nitrogen and water and their relationship with leaf gas exchange in corn |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2022.01.18 |
| Key Words: corn stomatal traits nitrogen water photosynthetic gas exchange |
| Author Name | Affiliation | | YUAN Jialiang | College of Forestry, Northwest A & F University, Yangling, Shaanxi 712100, China | | CAI Minglei | College of Forestry, Northwest A & F University, Yangling, Shaanxi 712100, China | | LI Yangyang | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China |
|
| Hits: 798 |
| Download times: 678 |
| Abstract: |
| A pot experiment with two\|factor and three\|level complete random design was used to study the responses of stomatal traits \[stomatal density, length, width, area, stomatal SPI index (SPI) and theoretical maximum stomatal conductance (gsmax)\] to nitrogen and water and their relationship with photosynthetic gas exchange in corn leaves to elucidate the structural basis of leaf gas exchange under different nitrogen and water availabilities. The results indicated that: (1) N application increased stomatal density, length, width, area, SPI and gsmax on the adaxial surface, and the increase percentage for ample N use treatment (N2) was 6.6%, 12.5%, 10.0%, 12.3%, 35.9% and 31.6%, respectively. N application also enhanced stomatal density, stomatal length, SPI and gsmax on the abaxial surface, and the increased percentage for N2 treatment was 14.4%, 4.7%, 25.5% and 20.9%, respectively. Irrigation significantly decreased stomatal density on the abaxial side with a 6.9% decrease for ample irrigation treatments (W2). Irrigation also increased stomatal length and area on both surfaces, with 5.3% and 4.1% increase of stomatal length and 7.2% and 7.1% increase of stomatal area on the adaxial and abaxial surfaces for W2 treatment. The influence of N use on stomatal traits was larger than irrigation. （2) No trade off relationship between stomatal size (stomatal length, width or area) and stomatal density was found for both leaf surfaces. (3) Photosynthetic rate and stomatal were mainly determined by stomatal size and SPI. gsmax explained 49.7% of photosynthetic rate variance and 39.7% of stomatal conductance variance. Transpiration rate was mainly determined by stomatal size on both sides, and instantaneous water use efficiency was mainly determined by adaxial stomatal density, stomatal size and SPI on both sides. These results demonstrated the physiological basis of N and water availabilities affecting leaf gas exchange from the angle of stomatal anatomy. |
|
|
|