Responses of Photosynthetic Characteristics and Water Potential of Alsophila spinulosa to Drought Stress and Rehydration

doi:10.13466/j.cnki.lyzygl.2023.01.007

Abstract

Abstract:

In order to clarify the adaptability of woody ferns to drought stress,3-year-old Alsophila spinulosa seedlings were selected for drought stress and rehydration treatment through potted water control.The changes of water potential and photosynthesis in the leaves of Alsophila spinulosa were studied after 3,6,9,12 days of drought and after 3,6,and 9 days of rehydration.The results showed that with the prolongation of drought time,the water potential of Alsophila spinulosa leaves showed an overall upward trend,the net photosynthetic rate (P_n) showed a downward trend,the inter-CO₂ concentration (C_i) first decreased and then increased,and the stomatal conductance (G_s) and transpiration rate (T_r) showed a trend of decreasing-increasing-decreasing.In the early stage of drought (6 days ago),the change trend of P_n,G_s and C_i was basically the same,and the decrease of P_n was mainly caused by stomatal limitation.In the later period of drought (after 6 days),the change trend of P_n was inconsistent with that of G_s and C_i,and the decrease of P_n was mainly caused by non-stomatal limitation.After rehydration,P_n and T_r of Alsophila spinulosa leaves recovered to the level of adequate water supply,while the water potential,G_s and C_i recovered to the level above that of adequate water supply.At the same time,the water use efficiency (WUE) of Alsophila spinulosa leaves increased first and then decreased with the prolongation of drought time,and showed a downward trend after 6 days of drought.And after rehydration,the WUE basically recovered to the level of adequate water supply.Taken together,Alsophila spinulosa has relatively poor drought tolerance and relatively strong rehydration recovery ability.Through the analysis of the photosynthetic physiological characteristics of drought stress and rehydration process,it is preliminarily considered that Alsophila spinulosa is a drought-avoiding plant.

Key words: Alsophila spinulosa, photosynthesis, drought stress, rehydration, water use efficiency, water potential

CLC Number:

Q945

LV Chaoyan, GAO Zhixi, XU Xingxian, WU Huan, CHEN Xingyan. Responses of Photosynthetic Characteristics and Water Potential of Alsophila spinulosa to Drought Stress and Rehydration[J]. FOREST RESOURCES WANAGEMENT, 2023, (1): 51-61.

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处理	水势/ MPa	净光合速率/ [μmol CO₂/(m²·s)]	气孔导度/ [mol H₂O/(m²·s)]	胞间CO₂浓度/ (μmol CO₂/mol)	蒸腾速率/ [mmol H₂O/(m²·s)]	水分利用效率/ (μmol CO₂/mmol H₂O)
充分供水	-0.9720	0.7423	0.0192	317.6725	0.5528	1.7349
干旱3d	-0.9471	0.6206	0.0160	277.9778	0.4389	1.7809
干旱6d	-0.9674	0.5790	0.0245	261.7283	0.5412	1.3600
干旱9d	-0.9043	0.5284	0.0175	282.6483	0.4631	1.3639
干旱12d	-0.8895	0.4276	0.0130	306.2833	0.4528	1.3395

处理	水势/ MPa	净光合速率/ [μmol CO₂/(m²·s)]	气孔导度/ [mol H₂O/(m²·s)]	胞间CO₂浓度/ (μmol CO₂/mol)	蒸腾速率/ [mmol H₂O/(m²·s)]	水分利用效率/ (μmol CO₂/mmol H₂O)
充分供水	-0.9720	0.7423	0.0192	317.6725	0.5528	1.7349
复水3d	-0.9067	0.5887	0.0280	318.2675	0.5560	1.3773
复水6d	-0.9290	0.6562	0.0396	326.3429	0.5946	1.7773
复水9d	-0.9073	0.7062	0.0284	348.1192	0.6477	1.7619