| The effect of water deficit on photosynthesis of citrus under drip irrigation |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2021.03.06 |
| Key Words: citrus water deficit re\|watering photosynthetic characteristics drip irrigation |
| Author Name | Affiliation | | CHEN Fei | State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, Sichuan 610065, China | | LI Hongping | State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, Sichuan 610065, China | | CUI Ningbo | State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, Sichuan 610065, China |
|
| Hits: 557 |
| Download times: 150 |
| Abstract: |
| In order to reveal the regulation effect of drip irrigation on photosynthetic characteristics of citrus leaves, 9-year-old ‘Shiranui’ citrus was used as the test material. A total of 4 water deficit treatments were designed in 2 stages of citrus, flowering stage (I) and young fruit stage (II). Meanwhile, the treatment without water deficit was considered as the control. The 4 water deficit treatments included 85% of irrigation amount (slight water deficit, LD), 70% of irrigation amount (moderate water deficit, MD1), 55% of irrigation amount (mild water deficit, MD2), and 40% of irrigation amount (severe water deficit, SD) of control. The response of photosynthetic characteristics of citrus leaves to water deficit and re\|watering was analyzed. Compared with the control treatment, Pn decreased significantly by 4.5%~28.4% and 6.2%~42.9% in stages I and II, respectively,except with LD (P<0.05). WUEi of different treatments was higher than that of CK, and the maximum values were obtained at I-MD1 and II-LD, respectively, which were 14.0% and 14.4% higher than that of CK（P＜0.05). After re\|watering, Pn, Gs, and Tr of different treatments were significantly increased. Compared with the state of water deficit, Pn in phases I and II increased by 68.2%~85.1% and 22.1%~44.0%, respectively. Re\|watering after slight water deficit had over compensation effect. Pn and WUEi of slight water deficit (I-LD and II-LD)were higher than that of CK, increased by 6.4% and 16.2%(I-LD), and 5.8% and 16.1%(I-LD), respectively.Therefore, slight water deficit (LD) treatment in stages I and II of citrus not only ensured high Pn and WUEi but also saved 15% irrigation water, which is a suitable water deficit model for citrus. |
|
|
|