Photosynthesis and Transpiration Characteristics of Polygonatum cyrtonema Under Different Shading Treatments

doi:10.11924/j.issn.1000-6850.casb20191000697

Abstract

Abstract:

Potted seedling of Polygonatum cyrtonema was used as experiment material, and four treatments were designed, i. e. full illumination (CK), light transmittance 83%+5% (T1), light transmittance 61%+5% (T2) and light transmittance 38%+5% (T3). We measured the photosynthesis and transpiration physiological indices of the P. cyrtonema and the major environmental factors, then compared the differences in photosynthesis and transpiration rates of P. cyrtonema as well as their relationship with environmental factors. The results showed that: (1) the diurnal variation of the net photosynthetic rate of P. cyrtonema under four shading treatments showed a single-peak curve, and no ‘midday photosynthetic break’ was observed, and the diurnal variation of net photosynthetic rate of P. cyrtonema under different shading treatments was T1> T2> T3> CK; (2) the diurnal variation of transpiration rate of P. cyrtonema under CK, T1 and T2 treatments was a bimodal curve, while that under T3 treatment was a single-peak curve; (3) the decrease of net photosynthetic rate of P. cyrtonema in the four treatments from 10:00 to 14:00 was caused by stomatal factors, while that from 14:00 to 16:00 was caused by non-stomatal factors; (4) with the increase of shading intensity, the correlation between transpiration rate and environmental factors was changed, and the greater the shading intensity, the stronger the correlation between transpiration rate and photosynthetic effective radiation (PAR). Our results indicate that increasing the black shading nets in a certain range could improve the photosynthetic and transpiration capacity of P. cyrtonema, and improve the growth of P. cyrtonema, and the effect of one layer of black shading nets and two layers of black shading nets is relatively good.

Key words: Polygonatum cyrtonema, shade, net photosynthetic rate, transpiration rate, environmental factors, correlation analysis

CLC Number:

S359.9

Tong Long, Zhang Lei, Chen Lijie, Gao Yongjun, Geng Yanghui, Li Bin. Photosynthesis and Transpiration Characteristics of Polygonatum cyrtonema Under Different Shading Treatments[J]. Chinese Agricultural Science Bulletin, 2020, 36(28): 84-91.

Figures/Tables 5

References 33

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处理	变量	PAR	Ta	RH	Ca
CK	Pn	0.079	-0.079	0.043	0.013
CK	Tr	0.569	0.301	-0.399	-0.384
T1	Pn	0.108	-0.178	0.179	-0.052
T1	Tr	0.68	0.309	-0.318	-0.23
T2	Pn	0.46	0.078	-0.015	0.16
T2	Tr	0.861^*	0.657	-0.64	-0.552
T3	Pn	0.171	-0.089	0.053	-0.016
T3	Tr	0.896^**	0.602	-0.503	-0.504

处理	变量	PAR	Ta	RH	Ca
CK	Pn	0.079	-0.079	0.043	0.013
CK	Tr	0.569	0.301	-0.399	-0.384
T1	Pn	0.108	-0.178	0.179	-0.052
T1	Tr	0.68	0.309	-0.318	-0.23
T2	Pn	0.46	0.078	-0.015	0.16
T2	Tr	0.861^*	0.657	-0.64	-0.552
T3	Pn	0.171	-0.089	0.053	-0.016
T3	Tr	0.896^**	0.602	-0.503	-0.504