Exogenous Spermidine: Effect on Biomass Accumulation and Photosynthetic Capacity of Maize Plants Under Waterlogging Stress

doi:10.11924/j.issn.1000-6850.casb2021-0759

Abstract

Abstract:

The effects of waterlogging on the biomass accumulation (BA) and photosynthetic capacity of maize and the effective relief measures were studied to provide a basis for the stress-resistant and high-yield cultivation of maize. Two maize inbred lines with different waterlogging tolerance were chosen to study the effect of exogenous spermidine on BA, leaf area, leaf chlorophyll content, net photosynthetic rate and chlorophyll fluorescence characteristics of maize under waterlogging stress. The results showed that compared to the control, the waterlogging treatment significantly reduced the maize biomass of root, shoot and plant, and leaf area, as well as the relative biomass accumulation rate. Along with the increase of waterlogging days, the chlorophyll content, net photosynthetic rate and actual photochemical efficiency gradually decreased, and the decline of Su95-1 (sensitive type) was the most obvious. Compared to those of the control, the BA and photosynthetic characteristics of the waterlogging treated plants with exogenous spermidine application significantly decreased, but they were higher than those in the waterlogging treatment, and the Su95-1 had a great increase. In summary, under waterlogging stress, exogenous spermidine can enhance the photosynthetic capacity and improve waterlogging tolerance of maize plants, and then increase the biomass accumulation.

Key words: maize, waterlogging stress, biomass accumulation, photosynthetic capacity, exogenous spermidine

CLC Number:

S513

CUI Yakun, KONG Lingjie, ZHENG Fei, LIU Ruixiang, CHEN Yanping, YUAN Jianhua. Exogenous Spermidine: Effect on Biomass Accumulation and Photosynthetic Capacity of Maize Plants Under Waterlogging Stress[J]. Chinese Agricultural Science Bulletin, 2022, 38(15): 22-26.

Figures/Tables 6

References 24

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品种	处理		地下部干重/(g/plant)		地上部干重/(g/plant)		单株干重/(g/plant)		根冠比		相对干物质积累速率/%
Su95-1	CK		0.70a		1.93b		2.63b		0.36a		229.94ab
	W1		0.72a		2.02b		2.74ab		0.36a		252.21a
	W2		0.32c		1.07d		1.39d		0.30cd		74.09d
	W3		0.35bc		1.13d		1.48d		0.31bc		90.01d
品种		处理		地下部干重/(g/plant)		地上部干重/(g/plant)		单株干重/(g/plant)		根冠比		相对干物质积累速率/%
JS131086		CK		0.72a		1.94b		2.66b		0.37a		181.10c
		W1		0.77a		2.24a		3.01a		0.34ab		206bc
		W2		0.36bc		1.41c		1.77c		0.26d		87.32d
		W3		0.42b		1.52c		1.94d		0.28cd		96.84d
F值		Fc		5.93^*		23.00^**		19.43^**		4.41		6.71^*
		Fw		377.99^**		221.53^**		308.97^**		69.01^**		323.79^**
		Fs		3.97		7.72^*		7.88^*		0.08		6.29^*

品种	处理		地下部干重/(g/plant)		地上部干重/(g/plant)		单株干重/(g/plant)		根冠比		相对干物质积累速率/%
Su95-1	CK		0.70a		1.93b		2.63b		0.36a		229.94ab
	W1		0.72a		2.02b		2.74ab		0.36a		252.21a
	W2		0.32c		1.07d		1.39d		0.30cd		74.09d
	W3		0.35bc		1.13d		1.48d		0.31bc		90.01d
品种		处理		地下部干重/(g/plant)		地上部干重/(g/plant)		单株干重/(g/plant)		根冠比		相对干物质积累速率/%
JS131086		CK		0.72a		1.94b		2.66b		0.37a		181.10c
		W1		0.77a		2.24a		3.01a		0.34ab		206bc
		W2		0.36bc		1.41c		1.77c		0.26d		87.32d
		W3		0.42b		1.52c		1.94d		0.28cd		96.84d
F值		Fc		5.93^*		23.00^**		19.43^**		4.41		6.71^*
		Fw		377.99^**		221.53^**		308.97^**		69.01^**		323.79^**
		Fs		3.97		7.72^*		7.88^*		0.08		6.29^*

		SPAD值	净光合速率	实际光化学效率
F值	Fc	0.8	2.8	0.9
	Fw	259.5^**	1954.6^**	147.0^**
	Fs	10.8^**	46.7^**	8.4^*

		SPAD值	净光合速率	实际光化学效率
F值	Fc	0.8	2.8	0.9
	Fw	259.5^**	1954.6^**	147.0^**
	Fs	10.8^**	46.7^**	8.4^*