Biomass allocation， water use characteristics， and photosynthetic light response of four Commelinaceae plants under different light intensities

doi:10.11686/cyxb2021250

Abstract

Abstract:

The aim of this study was to explore the effects of different light intensities on the biomass allocation， water use characteristics， and photosynthetic light response of Commelinaceae plants. The experimental materials were ramets of Commelina purpurea， Tradescantia fluminensis ‘Variegata’， Tradescantia zebrina， and Tradescantia fluminensis ‘Vairidia’. These materials were subjected to light at five different intensities， which were obtained using a shading net. It was found that， as the light intensity decreased （shading intensity 25%-75%）， the aboveground biomass of the four plants initially increased and then decreased （P<0.05）. The total biomass also increased and then decreased as the light intensity decreased， except that of C. purpurea， which showed no significant change. The effects of different light intensities on biomass allocation and the crown∶root ratio of the four plants were diverse， however， the proportion of the stem to total biomass tended to increase in all four plants as the light intensity decreased. The midday water potential increased with decreasing light intensity， and was strongly related to the trend in the water loss rate. Both C. purpurea and T. zebrina showed low rates of water loss. As the amount of photosynthetically active radiation increased， the net photosynthetic rates of the four plants first increased and then gradually stabilized. As the light intensity decreased， the maximum net photosynthetic rate， apparent quantum efficiency， and light saturation point of the four plants tended to first increase and then decrease. Compared with T. fluminensis ‘Variegata’ and ‘Vairidia’， C. purpurea and T. zebrina showed higher values for maximum net photosynthetic rate， apparent quantum efficiency， and light saturation point， and a lower dark respiration rate. The water use efficiencies of C. purpurea and T. zebrina did not differ significantly among the light intensity treatments， but were higher than those of T. fluminensis ‘Variegata’ and ‘Vairidia’. Together， the results suggest that these four plants are able to make more effective use of weak light resources by adjusting their morphology， biomass allocation， and photosynthetic light responses in weak light （shade density of 25%-75%）. Our results show that C. purpurea and T. zebrina are better able to cope with low light intensity than are T. fluminensis ‘Variegata’ and ‘Vairidia’.

Key words: light conditions, Commelinaceae, biomass allocation, water loss rate, photosynthetic light response

Qing XUE, Bin CHEN, Xiao-mei YANG, Yu-jia YANG, Zi-wei LI, Shan BO, Miao HE. Biomass allocation， water use characteristics， and photosynthetic light response of four Commelinaceae plants under different light intensities[J]. Acta Prataculturae Sinica, 2022, 31(1): 69-80.

Figures/Tables 6

References 44

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物种Species	处理 Treatments	最大净光合速率P_m （μmol·m^-2·s^-1）	表观量子效率 AQY （μmol·m^-2·s^-1）	光补偿点 LCP （μmol·m^-2·s^-1）	光饱和点 LSP （μmol·m^-2·s^-1）	暗呼吸速率 R_d （μmol·m^-2·s^-1）	水分利用效率WUE （μmol·mmol^-1）	决定系数 R²
CP	L₀	5.54±0.17b	0.023±0.01c	35.96±7.09a	123.66±29.91a	0.77±0.04b	2.54±0.11a	0.999
	L₁	6.70±0.48ab	0.042±0.00b	21.83±1.55b	195.94±21.78bc	1.02±0.13b	2.57±0.08a	0.999
	L₂	7.07±0.53a	0.061±0.01a	27.10±7.49ab	257.44±28.84c	1.74±0.21a	2.02±0.11a	0.989
	L₃	6.49±1.22ab	0.043±0.01bc	28.91±5.99ab	159.83±10.71ab	0.89±0.07b	2.53±0.32a	0.988
	L₄	3.79±0.27c	0.039±0.01bc	10.94±2.29c	138.68±8.18c	0.31±0.19c	2.15±0.04a	0.998
TF	L₀	3.25±0.07b	0.040±0.00a	22.01±1.68a	106.40±2.77b	0.88±0.05ab	1.12±0.04b	0.999
	L₁	4.93±0.13a	0.043±0.01ab	26.76±1.68a	174.81±8.51a	0.89±0.02ab	1.72±0.01a	0.996
	L₂	4.50±0.76a	0.032±0.00ab	25.88±8.16a	169.21±36.71a	0.63±0.44b	2.01±0.20a	0.988
	L₃	3.06±0.08b	0.030±0.00ab	35.51±0.83a	137.12±5.70ab	1.05±0.03a	1.17±0.11b	0.998
	L₄	1.93±0.06c	0.023±0.02b	35.51±1.46a	98.53±25.82b	0.63±0.01b	0.98±0.04b	0.969
TZ	L₀	2.82±0.24c	0.057±0.01b	10.28±0.03c	49.11±0.17b	0.07±0.01d	1.91±0.09a	0.998
	L₁	4.14±0.31b	0.087±0.01a	8.51±0.03bc	52.75±0.15b	0.30±0.02b	2.05±0.05a	0.998
	L₂	4.71±0.14a	0.060±0.01b	5.69±0.74b	101.01±15.06a	0.29±0.01b	1.90±0.04a	0.998
	L₃	3.93±0.10b	0.051±0.01b	9.61±2.28a	110.29±34.99a	0.45±0.07a	2.21±0.30a	0.988
	L₄	1.85±0.25d	0.023±0.01c	5.84±1.37b	98.65±1.45a	0.13±0.01c	1.72±0.07a	0.969
TV	L₀	3.19±0.07d	0.053±0.00a	7.33±0.03cd	75.26±0.02b	0.35±0.01b	1.82±0.18b	0.989
	L₁	4.66±0.19b	0.061±0.04a	9.69±1.31b	157.12±30.21a	0.37±0.11b	2.65±0.06a	0.968
	L₂	5.84±0.33a	0.054±0.00a	16.41±0.11a	133.87±0.92a	0.82±0.05a	2.44±0.15a	0.999
	L₃	3.95±0.10c	0.052±0.00a	8.61±1.31bc	89.29±0.92b	0.42±0.06b	1.60±0.02b	0.989
	L₄	2.43±0.05e	0.047±0.01a	6.57±1.52d	68.79±10.67b	0.21±0.03c	1.49±0.04b	0.998

物种Species	处理 Treatments	最大净光合速率P_m （μmol·m^-2·s^-1）	表观量子效率 AQY （μmol·m^-2·s^-1）	光补偿点 LCP （μmol·m^-2·s^-1）	光饱和点 LSP （μmol·m^-2·s^-1）	暗呼吸速率 R_d （μmol·m^-2·s^-1）	水分利用效率WUE （μmol·mmol^-1）	决定系数 R²
CP	L₀	5.54±0.17b	0.023±0.01c	35.96±7.09a	123.66±29.91a	0.77±0.04b	2.54±0.11a	0.999
	L₁	6.70±0.48ab	0.042±0.00b	21.83±1.55b	195.94±21.78bc	1.02±0.13b	2.57±0.08a	0.999
	L₂	7.07±0.53a	0.061±0.01a	27.10±7.49ab	257.44±28.84c	1.74±0.21a	2.02±0.11a	0.989
	L₃	6.49±1.22ab	0.043±0.01bc	28.91±5.99ab	159.83±10.71ab	0.89±0.07b	2.53±0.32a	0.988
	L₄	3.79±0.27c	0.039±0.01bc	10.94±2.29c	138.68±8.18c	0.31±0.19c	2.15±0.04a	0.998
TF	L₀	3.25±0.07b	0.040±0.00a	22.01±1.68a	106.40±2.77b	0.88±0.05ab	1.12±0.04b	0.999
	L₁	4.93±0.13a	0.043±0.01ab	26.76±1.68a	174.81±8.51a	0.89±0.02ab	1.72±0.01a	0.996
	L₂	4.50±0.76a	0.032±0.00ab	25.88±8.16a	169.21±36.71a	0.63±0.44b	2.01±0.20a	0.988
	L₃	3.06±0.08b	0.030±0.00ab	35.51±0.83a	137.12±5.70ab	1.05±0.03a	1.17±0.11b	0.998
	L₄	1.93±0.06c	0.023±0.02b	35.51±1.46a	98.53±25.82b	0.63±0.01b	0.98±0.04b	0.969
TZ	L₀	2.82±0.24c	0.057±0.01b	10.28±0.03c	49.11±0.17b	0.07±0.01d	1.91±0.09a	0.998
	L₁	4.14±0.31b	0.087±0.01a	8.51±0.03bc	52.75±0.15b	0.30±0.02b	2.05±0.05a	0.998
	L₂	4.71±0.14a	0.060±0.01b	5.69±0.74b	101.01±15.06a	0.29±0.01b	1.90±0.04a	0.998
	L₃	3.93±0.10b	0.051±0.01b	9.61±2.28a	110.29±34.99a	0.45±0.07a	2.21±0.30a	0.988
	L₄	1.85±0.25d	0.023±0.01c	5.84±1.37b	98.65±1.45a	0.13±0.01c	1.72±0.07a	0.969
TV	L₀	3.19±0.07d	0.053±0.00a	7.33±0.03cd	75.26±0.02b	0.35±0.01b	1.82±0.18b	0.989
	L₁	4.66±0.19b	0.061±0.04a	9.69±1.31b	157.12±30.21a	0.37±0.11b	2.65±0.06a	0.968
	L₂	5.84±0.33a	0.054±0.00a	16.41±0.11a	133.87±0.92a	0.82±0.05a	2.44±0.15a	0.999
	L₃	3.95±0.10c	0.052±0.00a	8.61±1.31bc	89.29±0.92b	0.42±0.06b	1.60±0.02b	0.989
	L₄	2.43±0.05e	0.047±0.01a	6.57±1.52d	68.79±10.67b	0.21±0.03c	1.49±0.04b	0.998

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