施磷对苜蓿叶片生理参数及抗氧化能力的影响

doi:10.3864/j.issn.0578-1752.2023.03.005

Abstract

Abstract:

【Objective】The aim of this study was to investigate the effects on nutrient uptake, photosynthetic pigment content, stomatal aperture and antioxidant system of alfalfa leaves after three consecutive years of phosphorus fertilizer application, so as to provide scientific fertilization methods for efficient production of alfalfa.【Method】Field trials were conducted at the forage experiment station of Shihezi University in Xinjiang from 2019 to 2021. ‘WL366HQ’ alfalfa was used as the test material, and four fertilizer treatments in the experiment included 0 (CK), 50 (Low P, LP), 100 (Middle P, MP), and 150 (High P, HP) kg·hm^-2. Samples were taken at the first flowering of alfalfa to determine the hay yield, nitrogen and phosphorus content, pigment content, stomatal opening, antioxidant enzyme activity, and oxidizing substances of leaves.【Result】The nitrogen and phosphorus content, photosynthetic pigment content and stomatal aperture of leaves of alfalfa increased significantly (P<0.05) after 3 years of continuous phosphorus fertilization, with the highest nitrogen and phosphorus content under MP treatment (54.74 and 2.99 g·kg^-1, respectively), the highest chlorophyll a and chlorophyll b content under MP, and the highest carotenoid content under LP or MP, and the lowest in CK. The stomatal aperture was the highest under MP and significantly higher than that under CK (P<0.05). Therefore, phosphorus fertilizer had different effects on the morphological and physiological characteristics of alfalfa leaves, and MP treatment significantly affected the photosynthetic and physiological characteristics of alfalfa leaves (P<0.05). Superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) activities were the highest under MP, with the value of 162.55, 406.40 and 147.13 U·g^-1, respectively, and were significantly higher than those under CK (P<0.05). The malondialdehyde (MDA), hydrogen peroxide (H₂O₂) and proline (Pro) content were the lowest under MP, at 2.38 and 1.04 μmol·g^-1 and 56.85 μg·g^-1, respectively. According to the Pearson correlation analysis, the total N and P contents of alfalfa leaves showed significant positive correlation (P<0.05) with chlorophyll content, carotenoid content, stomatal aperture, SOD activity and POD activity, and significant negative correlation (P<0.05) with MDA and H₂O₂ content. The overall evaluation showed that the principal component scores of phosphorus application treatments were ranked as MP>HP>LP>CK. 【Conclusion】 The reasonable application of phosphorus fertilizer increased the nutritional characteristics and photosynthetic physiological characteristics of alfalfa leaves, thus avoiding the stressful effects brought by other environmental factors, enhancing the adaptive capacity of alfalfa, and making it better adapted to external environmental changes. Considering the leaf morphology, photosynthetic physiological characteristics and antioxidant enzymes and oxidizing substances of alfalfa, the phosphorus application rate of 100 kg·hm^-2 was suitable under this experiment.

Key words: alfalfa, phosphorus fertilizer, leaf phenotype, leaf physiology, hay yield

ZHAO JianTao, YANG KaiXin, WANG XuZhe, MA ChunHui, ZHANG QianBing. Effect of Phosphorus Application on Physiological Parameters and Antioxidant Capacity in Alfalfa Leaves[J].Scientia Agricultura Sinica, 2023, 56(3): 453-465.

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茬次 Stubble time	处理 Treatment	气孔数 Stomatal number	气孔长度 Stomatal longitudinal diameter (μm)	气孔宽度 Stomatal transverse diameter (μm)	气孔开度 Stomatal aperture (μm²)
第1茬 First cut	CK	17.5±0.77a	29.43±0.76b	10.00±0.44b	230.97±11.31b
	LP	18.3±0.77a	29.51±0.70b	11.15±0.35a	248.78±6.56b
	MP	19.4±1.25a	32.80±0.79a	11.29±0.30a	290.58±9.81a
	HP	17.6±0.75a	29.54±0.50b	9.77±0.34b	225.93±6.46b
第2茬 Second cut	CK	15.3±0.49b	28.38±0.50b	6.98±0.18b	155.87±5.59b
	LP	19.7±0.99a	30.25±0.47a	8.52±0.16a	202.50±4.88a
	MP	19.8±0.79a	30.49±0.26a	8.54±0.14a	204.46±6.75a
	HP	15.0±0.52b	28.36±0.38b	7.05±0.24b	156.62±4.30b
第3茬 Third cut	CK	16.9±0.77a	30.93±0.69bc	10.14±0.35a	246.23±11.80a
	LP	19.1±0.77a	31.21±0.61b	10.30±0.34a	251.53±6.98a
	MP	19.6±1.25a	33.30±0.78a	10.43±0.23a	272.60±9.58a
	HP	18.5±0.74a	29.04±0.50c	9.41±0.34a	213.95±6.36b
第4茬 Fourth cut	CK	19.7±2.04ab	28.83±1.15a	6.27±0.34bc	141.08±7.72c
	LP	20.7±0.40ab	30.69±0.50a	7.06±0.21b	170.04±5.79b
	MP	22.7±1.18a	30.52±0.67a	8.33±0.40a	201.03±13.86a
	HP	17.8±0.83b	29.65±0.51a	6.00±0.26c	139.43±5.50c

Effect of Phosphorus Application on Physiological Parameters and Antioxidant Capacity in Alfalfa Leaves

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