Exogenous Silicon: Effects on Maize and Teosinte Seedlings Under Low Temperature Stress

doi:10.11924/j.issn.1000-6850.casb2022-0135

Abstract

Abstract:

In order to study the adaptability of maize and teosinte seedlings enhanced by exogenous silicon under low temperature stress, five treatments, including CK, LT, S1, S2 and S3, were designed with three replicates, using common maize varieties and wild teosinte as materials. The morphological indexes, chlorophyll content, malondialdehyde content and SOD activity of maize and teosinte were determined. The results showed that exogenous silicon effectively alleviated the damage of low temperature stress on maize and teosinte. (1) The morphological indexes of maize and teosinte under S1, S2 and S3 increased by different degrees compared with those under LT. (2) The chlorophyll content of maize and teosinte increased most significantly under S2 and S3 respectively, by 42.08% and 84.38% respectively compared with that under LT. (3) The malondialdehyde content of maize and teosinte under S1, S2 and S3 were lower than that under LT, and the lowest malondialdehyde content was found under S2 for maize and teosinte, which was 31.44% and 34.72% lower than that under LT, respectively. (4) Under S1, S2 and S3 treatments, the SOD activity of maize and teosinte was higher than that of LT, and SOD activity in maize leaves was the highest under S2, which was 14.24% higher than that under LT. SOD activity in teosinte leaves was the highest under S3, which was 14.96% higher than that under LT. In conclusion, exogenous silicon could improve the biomass accumulation and the activities of antioxidant enzymes of maize and teosinte under low temperature stress, increase the synthesis of photosynthetic pigments, reduce the accumulation of reactive oxygen, and enhance the cold tolerance of the seedlings.

Key words: maize, teosinte, low temperature stress, exogenous silicon, physiological traits

HUANG Hao, LU Yuncai. Exogenous Silicon: Effects on Maize and Teosinte Seedlings Under Low Temperature Stress[J]. Chinese Agricultural Science Bulletin, 2023, 39(5): 21-27.

Figures/Tables 6

References 30

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作物	处理	株高/cm	地上部鲜重/g	地上部干重/g	根长/cm	根鲜重/g	根干重/g
玉米	CK	53.83±0.57a	6.39±0.13a	0.609±0.004a	32.73±0.46a	2.28±0.05a	0.179±0.004a
	LT	31.50±0.50d	1.92±0.09c	0.161±0.001d	27.57±0.38c	1.07±0.06e	0.091±0.003e
	S1	33.17±0.76c	2.03±0.04bc	0.175±0.003c	29.33±0.29b	1.28±0.02d	0.103±0.001d
	S2	35.60±0.79b	2.24±0.10b	0.195±0.003b	32.27±0.64a	1.59±0.02b	0.119±0.001b
	S3	33.93±0.81c	2.08±0.11c	0.181±0.003c	29.67±0.58b	1.36±0.05c	0.110±0.002c
大刍草	CK	40.07±0.12a	2.21±0.09a	0.197±0.006a	25.67±1.15a	0.58±0.03a	0.047±0.002a
	LT	30.10±0.40d	0.70±0.05c	0.055±0.002d	19.33±0.58c	0.21±0.01d	0.015±0.005d
	S1	30.83±0.29c	0.73±0.02bc	0.057±0.002d	21.17±1.04c	0.24±0.03d	0.017±0.001c
	S2	31.17±0.21c	0.77±0.03bc	0.062±0.001c	21.73±1.50bc	0.28±0.02c	0.023±0.001b
	S3	31.93±0.71b	0.80±0.02b	0.070±0.001b	22.67±0.58b	0.32±0.01b	0.023±0.003b

作物	处理	株高/cm	地上部鲜重/g	地上部干重/g	根长/cm	根鲜重/g	根干重/g
玉米	CK	53.83±0.57a	6.39±0.13a	0.609±0.004a	32.73±0.46a	2.28±0.05a	0.179±0.004a
	LT	31.50±0.50d	1.92±0.09c	0.161±0.001d	27.57±0.38c	1.07±0.06e	0.091±0.003e
	S1	33.17±0.76c	2.03±0.04bc	0.175±0.003c	29.33±0.29b	1.28±0.02d	0.103±0.001d
	S2	35.60±0.79b	2.24±0.10b	0.195±0.003b	32.27±0.64a	1.59±0.02b	0.119±0.001b
	S3	33.93±0.81c	2.08±0.11c	0.181±0.003c	29.67±0.58b	1.36±0.05c	0.110±0.002c
大刍草	CK	40.07±0.12a	2.21±0.09a	0.197±0.006a	25.67±1.15a	0.58±0.03a	0.047±0.002a
	LT	30.10±0.40d	0.70±0.05c	0.055±0.002d	19.33±0.58c	0.21±0.01d	0.015±0.005d
	S1	30.83±0.29c	0.73±0.02bc	0.057±0.002d	21.17±1.04c	0.24±0.03d	0.017±0.001c
	S2	31.17±0.21c	0.77±0.03bc	0.062±0.001c	21.73±1.50bc	0.28±0.02c	0.023±0.001b
	S3	31.93±0.71b	0.80±0.02b	0.070±0.001b	22.67±0.58b	0.32±0.01b	0.023±0.003b

指标	处理
指标	CK	LT	S1	S2	S3
株高	1.00	0.00	0.07	0.18	0.11
地上部鲜重	1.00	0.00	0.02	0.07	0.04
地上部干重	1.00	0.00	0.03	0.08	0.04
根长	1.00	0.00	0.34	0.91	0.41
根鲜重	1.00	0.00	0.17	0.43	0.24
根干重	1.00	0.00	0.14	0.32	0.22
叶绿素	1.00	0.00	0.49	0.84	0.47
丙二醛	0.00	1.00	0.45	0.29	0.71
SOD	0.00	0.24	0.44	1.00	0.49
隶属函数值	0.78	0.14	0.24	0.46	0.30
位次	1	5	4	2	3

指标	处理
指标	CK	LT	S1	S2	S3
株高	1.00	0.00	0.07	0.18	0.11
地上部鲜重	1.00	0.00	0.02	0.07	0.04
地上部干重	1.00	0.00	0.03	0.08	0.04
根长	1.00	0.00	0.34	0.91	0.41
根鲜重	1.00	0.00	0.17	0.43	0.24
根干重	1.00	0.00	0.14	0.32	0.22
叶绿素	1.00	0.00	0.49	0.84	0.47
丙二醛	0.00	1.00	0.45	0.29	0.71
SOD	0.00	0.24	0.44	1.00	0.49
隶属函数值	0.78	0.14	0.24	0.46	0.30
位次	1	5	4	2	3

指标	处理
指标	CK	LT	S1	S2	S3
株高	1.00	0.00	0.07	0.11	0.18
地上部鲜重	1.00	0.00	0.02	0.05	0.07
地上部干重	1.00	0.00	0.01	0.05	0.11
根长	1.00	0.00	0.29	0.38	0.53
根鲜重	1.00	0.00	0.08	0.19	0.30
根干重	1.00	0.00	0.06	0.25	0.25
叶绿素	1.00	0.00	0.34	0.49	0.63
丙二醛	0.00	1.00	0.45	0.29	0.71
SOD	0.00	0.24	0.44	1.00	0.49
隶属函数值	0.78	0.14	0.20	0.31	0.36
位次	1	5	4	3	2