Effects of deficit irrigation at different growth stages on photosynthetic characteristics, yield and quality of Astragalus membranaceus var. mongholicus

doi:10.3969/j.issn.1004-1524.20240656

Acta Agriculturae Zhejiangensis ›› 2025, Vol. 37 ›› Issue (4): 779-789.DOI: 10.3969/j.issn.1004-1524.20240656

• Crop Science • Previous Articles Next Articles

Effects of deficit irrigation at different growth stages on photosynthetic characteristics, yield and quality of Astragalus membranaceus var. mongholicus

LI Yancui¹(), LI Fuqiang²^,^*(), ZHOU Bo¹

1. Gansu Research Institute for Water Conservancy, Lanzhou 730030, China
2. College of Water Conservancy and Hydropower Engineering, Gansu Agricultural University, Lanzhou 730070, China

Received:2024-07-20 Online:2025-04-25 Published:2025-05-09

Abstract

Abstract:

In order to investigate the effects of deficit irrigation at different growth stages on photosynthetic characteristics, water productivity and medicinal quality of Astragalus membranaceus var. mongholicus under film drip irrigation, a field experiment was carried out in the cold irrigation district of Hexi Oasis of China. Mild (65%-75% of the field capacity) and moderate (55%-65% of the field capacity) water deficit were applied at seedling, budding and flowering, root elongation and root thickening stages, respectively, and full irrigation (75%-85% of the field capacity) during the whole growth stage was used as the control (CK). The results showed that compared to the CK, water deficit at different growth stages significantly (P<0.05) reduced the relative chlorophyll content (SPAD value), net photosynthetic rate, transpiration rate, stomatal conductance in leaves of A. membranaceus var. mongholicus. The yield under mild water deficit treatments at seedling or budding and flowering stages was not significantly different from that under CK, but the water use efficiency increased significantly by 13.98% and 12.99%, respectively. Compared to the CK, mild water deficit treatments at root elongation and root thickening stages significantly increased astragaloside content by 4.05% and 3.57%, respectively, and calycosin-7-glucoside content by 9.53% and 10.20%, respectively, but the yield under the two treatments was significantly decreased by 8.79% and 13.99%, respectively. The comprehensive evaluation result showed that the mild water deficit treatment at seedling stage could be recommended as an appropriate deficit irrigation strategy for A. membranaceus var. mongholicus production in Hexi Oasis irrigation area.

Key words: water deficit, photosynthetic characteristics, yield, quality, comprehensive evaluation, Astragalus membranaceus var. mongholicu

CLC Number:

S567.239

LI Yancui, LI Fuqiang, ZHOU Bo. Effects of deficit irrigation at different growth stages on photosynthetic characteristics, yield and quality of Astragalus membranaceus var. mongholicus[J]. Acta Agriculturae Zhejiangensis, 2025, 37(4): 779-789.

Figures/Tables 7

References 36

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处理 Treatment	各生育期土壤相对含水量的设计区间(下限值~上限值) Design range of soil relative water content at each growth stage (lower limit-upper limit)
处理 Treatment	苗期 Seedling stage	现蕾开花期 Budding and flowering stage	根茎伸长期 Root elongation stage	根茎增粗期 Root thickening stage
WD1	65~75	75~85	75~85	75~85
WD2	55~65	75~85	75~85	75~85
WD3	75~85	65~75	75~85	75~85
WD4	75~85	55~65	75~85	75~85
WD5	75~85	75~85	65~75	75~85
WD6	75~85	75~85	55~65	75~85
WD7	75~85	75~85	75~85	65~75
WD8	75~85	75~85	75~85	55~65
CK	75~85	75~85	75~85	75~85

处理 Treatment	各生育期土壤相对含水量的设计区间(下限值~上限值) Design range of soil relative water content at each growth stage (lower limit-upper limit)
处理 Treatment	苗期 Seedling stage	现蕾开花期 Budding and flowering stage	根茎伸长期 Root elongation stage	根茎增粗期 Root thickening stage
WD1	65~75	75~85	75~85	75~85
WD2	55~65	75~85	75~85	75~85
WD3	75~85	65~75	75~85	75~85
WD4	75~85	55~65	75~85	75~85
WD5	75~85	75~85	65~75	75~85
WD6	75~85	75~85	55~65	75~85
WD7	75~85	75~85	75~85	65~75
WD8	75~85	75~85	75~85	55~65
CK	75~85	75~85	75~85	75~85

处理 Treatment	根长 Root length/cm	根粗 Root diameter/mm	产量 Yield/(kg·hm^-2)	耗水量 Water consumption/mm	水分利用效率 Water use efficiency/(kg·m^-3)
WD1	46.84±1.58 a	11.32±0.23 a	4 377.80±148.36 a	374.10±12.14 b	1.18±0.03 a
WD2	44.50±1.26 abc	10.85±0.27 ab	4 117.69±185.90 abc	350.90±8.50 cd	1.17±0.06 a
WD3	46.59±1.61 a	11.35±0.46 a	4 285.52±253.83 a	369.69±6.59 b	1.16±0.09 a
WD4	43.53±0.94 bcd	10.81±0.24 ab	3 919.77±83.92 bc	356.64±10.71 bc	1.10±0.01 ab
WD5	36.66±1.36 e	10.52±0.16 b	3 825.83±175.19 cd	364.10±5.04 bc	1.05±0.04 bc
WD6	35.80±1.43 e	9.31±0.27 c	3 263.75±128.40 e	337.63±10.46 d	0.97±0.04 cd
WD7	42.81±1.47 cd	9.39±0.17 c	3 607.86±132.28 d	366.05±10.63 bc	0.99±0.02 cd
WD8	41.15±1.53 d	8.09±0.45 d	3 152.92±146.49 e	347.63±7.72 cd	0.91±0.06 d
CK	45.86±134 ab	10.95±0.26 ab	4 194.74±156.04 ab	409.00±13.06 a	1.03±0.06 bc

处理 Treatment	根长 Root length/cm	根粗 Root diameter/mm	产量 Yield/(kg·hm^-2)	耗水量 Water consumption/mm	水分利用效率 Water use efficiency/(kg·m^-3)
WD1	46.84±1.58 a	11.32±0.23 a	4 377.80±148.36 a	374.10±12.14 b	1.18±0.03 a
WD2	44.50±1.26 abc	10.85±0.27 ab	4 117.69±185.90 abc	350.90±8.50 cd	1.17±0.06 a
WD3	46.59±1.61 a	11.35±0.46 a	4 285.52±253.83 a	369.69±6.59 b	1.16±0.09 a
WD4	43.53±0.94 bcd	10.81±0.24 ab	3 919.77±83.92 bc	356.64±10.71 bc	1.10±0.01 ab
WD5	36.66±1.36 e	10.52±0.16 b	3 825.83±175.19 cd	364.10±5.04 bc	1.05±0.04 bc
WD6	35.80±1.43 e	9.31±0.27 c	3 263.75±128.40 e	337.63±10.46 d	0.97±0.04 cd
WD7	42.81±1.47 cd	9.39±0.17 c	3 607.86±132.28 d	366.05±10.63 bc	0.99±0.02 cd
WD8	41.15±1.53 d	8.09±0.45 d	3 152.92±146.49 e	347.63±7.72 cd	0.91±0.06 d
CK	45.86±134 ab	10.95±0.26 ab	4 194.74±156.04 ab	409.00±13.06 a	1.03±0.06 bc

处理 Treatment	D⁺	D^-	C	排名 Ranking
WD1	0.308	0.804	0.723	1
WD2	0.545	0.585	0.518	6
WD3	0.305	0.762	0.715	2
WD4	0.649	0.468	0.419	7
WD5	0.341	0.767	0.692	3
WD6	0.902	0.137	0.132	9
WD7	0.442	0.716	0.618	5
WD8	0.868	0.266	0.235	8
CK	0.402	0.722	0.643	4

Effects of deficit irrigation at different growth stages on photosynthetic characteristics, yield and quality of Astragalus membranaceus var. mongholicus

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