玉米荫蔽对大豆光合特性与叶脉、气孔特征的影响

doi:10.3864/j.issn.0578-1752.2019.21.007

Abstract

Abstract:

【Objective】 The aim of this study was to explore the effects of maize shading on the photosynthetic characteristics, leaf veins and stomatal characteristics of soybean during the symbiosis period under the maize-soybean intercropping system. 【Method】 Two factors were used in a completely randomized pot experiment under natural light, strong shade tolerant Nandou 12 and light shade tolerant Guixia 3, including the T1 (intercropping of 2 rows of maize and 2 rows of soybean), T2 (intercropping of 1 row of maize and 1 row of soybean) and CK (net for soybean) three treatments, respectively, to analyze photosynthetic parameters, veins and the porosity characteristic parameters’ responding under shading. 【Result】 By contrast with the net treatment, the far-red spectral irradiance of soybean canopy increased significantly under the shade of maize, and the light intensity under T1 and T2 treatment decreased by 48.62% and 77.39%, respectively. Photosynthetic rate, stomatal conductance, leaf vein density and stomatal density of soybean under maize shading were significantly less than those under CK (P＜0.05), and the decrease rate increased with the increase of shade (from T1 to T2). Compared with CK, the net photosynthetic rate of Nandou 12 decreased significantly by 41.00% and 44.15% respectively under T1 and T2 treatment, the net photosynthetic rate of Guixia 3 decreased significantly by 44.62% and 47.93%, respectively, while stomatal conductance of Nandou 12 decreased significantly by 29.19% and 39.69%, and that of Guixia 3 decreased significantly by 26.83% and 49.50%, respectively. The vein density and stomatal density of Nandou 12 decreased by 14.99%, 20.01% and stomatal density decreased by 12.79%, 18.27% respectively under T1 and T2 treatment compared with CK; The vein density and stomatal density of Guixia 3 decreased by 10.38%, 27.62% and stomatal density decreased by 15.77%, 22.46% respectively under T1 and T2 treatment compared with CK. The net photosynthetic rate of soybean had significant positive correlation (P＜0.05) with stomatal conductance, vein closure, stomatal density as well as vein density, and extremely negative correlation (P＜0.01) with vein distance. In addition, there was an extremely significant positive correlation (P＜0.01) between vein density and stomatal density. The vein density, vein length, veins closure, and the distance between the veins of Nandou 12 under maize shading were better than those of Guixia 3. In addition, the shade degree under T1 treatment was higher, while transpiration rate and vein closure, photosynthetic, vein and stomatal parameters of strong shade tolerant Nandou12 all change were less than those of Guixai 3, and Nandou had higher photosynthetic rate.【Conclusion】 In the maize-soybean intercropping system, the changes of canopy light environment, leaf vein and stomatal characteristics of soybean could reduce the photosynthetic ability of soybean, but the response of leaf vein and stomatal characteristics of different shade-tolerant soybean varieties to shading was different.

Key words: intercropping, soybean, photosynthetic characteristics, veins, stomatal

LI ShengLan,TAN TingTing,FAN YuanFang,YANG WenYu,YANG Feng. Effects of Maize Shading on Photosynthetic Characteristics, Vein and Stomatal Characteristics of Soybean[J].Scientia Agricultura Sinica, 2019, 52(21): 3782-3793.

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References 38

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品种 Variety	处理 Treatment	净光合速率 P_n (μmol·m^-2·s^-1)	气孔导度 G_s(μmol·m^-2·s^-1)	胞间CO₂浓度 C_i (μmol·m^-2·s^-1)	蒸腾速率 T_r (g·m^-2·h^-1)
南豆12 Nandou 12	CK	27.93±0.82a	0.45±0.01a	243.00±6.53a	5.15±0.08b
	T1	16.73±0.66b	0.32±0.02b	237.33±8.06a	6.16±0.27a
	T2	15.60±0.99b	0.27±0.02c	251.67±20.17a	3.06±0.22c
桂夏3号 Guixia 3	CK	27.67±1.52a	0.43±0.02a	230.67±5.56a	4.40±0.14b
	T1	15.10±1.49b	0.32±0.05b	209.00±36.51a	5.33±0.32a
	T2	14.20±1.07b	0.22±0.02c	251.33±5.73a	2.78±0.05c
F
品种Variety		2.64	8.96	0.30	38.56**
处理Treatment		289.39**	84.23**	2.84	93.37**
品种×处理Variety×Treatment		1.78	1.36	5.11	2.01

品种 Variety	处理 Treatment	叶脉密度 Vein density (mm·mm^-2)	叶脉长度 The length of the veins (mm)	叶脉直径 Vein diameter (μm)	叶脉闭合度 Vein Closure (No./mm²）	叶脉间距 Distance between veins (μm)
南豆12 Nandou 12	CK	66.11±4.88a	19.79±2.46a	22.38±1.65c	4.23±1.52a	130.34±5.72c
	T1	59.25±3.66b	17.74±1.38b	28.11±1.86b	3.21±0.93b	167.92±7.77b
	T2	47.85±3.05c	14.33±1.47c	32.11±2.39a	2.36±0.79c	188.28±6.44a
桂夏3号 Guixia 3	CK	61.84±4.82a	18.51±2.27a	26.80±1.68b	3.85±1.27a	133.48±5.81c
	T1	52.57±4.33b	15.74±1.36b	28.03±1.72b	2.00±1.45b	160.72±8.04b
	T2	49.46±3.97c	14.81±1.43c	33.26±2.17a	1.92±0.84b	188.86±7.96a
F
品种Variety		24.406**	24.406**	3.731	11.641**	10.853**
处理Treatment		2.677	2.677	24.259**	3.470*	2.387
品种×处理Variety×Treatment		6.012**	6.012**	4.969*	19.198**	8.194**

品种 Variety	处理 Treatment	气孔密度 Stomatal density (No./mm²)	气孔长度 Stomatal length (nm)	气孔宽度 Stomatal width (nm)	气孔周长 Stomatal circumference (nm)	气孔面积 Stomatal area (nm²)
南豆12 Nandou 12	CK	149.96±11.56a	21.67±0.41b	3.52±0.18a	54.77±0.82b	130.15±6.93a
	T1	130.78±2.82b	22.71±1.49b	2.98±0.09b	56.15±0.37a	123.42±1.06a
	T2	122.56±6.68b	23.90±1.38a	2.54±0.28c	57.08±1.01a	98.21±4.06b
桂夏3号 Guixia 3	CK	151.12±0.63a	21.50±0.64c	2.83±0.05a	55.06±3.28b	130.91±3.78a
	T1	127.29±0.55ab	23.19±1.42b	2.08±0.12b	56.78±0.93a	91.56±2.30c
	T2	117.18±1.99b	24.495±0.28a	1.85±0.01b	57.93±2.25a	120.00±3.28b
F
品种Variety		0.17	0.92	138.89**	2.96	1.57
处理Treatment		9.33*	25.05**	86.65**	21.11**	67.66**
品种×处理Variety×Treatment		0.11	0.59	1.05	0.25	0.70

参数 Parameter	净光合速率 P_n	气孔导度 Gs	叶脉密度 Vein density	叶脉直径 Vein diameter	叶脉闭合度 Vein closure	叶脉间距 Distance between veins
气孔导度 G_s	0.94**
叶脉密度 Vein density	0.87*	0.92*
叶脉直径 Vein diameter	-0.81	-0.93**	-0.92**
叶脉闭合度 Vein closure	0.93**	0.91*	0.94**	-0.84*
叶脉间距 Distance between veins	-0.92*	-0.98**	-0.91*	0.93**	-0.85*
气孔密度 Stomatal density	0.97**	0.98**	0.92**	-0.87*	0.94**	-0.97**

Effects of Maize Shading on Photosynthetic Characteristics, Vein and Stomatal Characteristics of Soybean

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