Effects of Flooding Stress on Photosynthetic Characteristics of Yulania stellata and Its Cultivars

doi:10.7525/j.issn.1673-5102.2022.03.018

Abstract

Abstract:

In order to clarify the response rules of photosynthetic and physiological characteristics of Yulania stellata to flooding stress， the double-pot method was used to Y. stellata and its 4 cultivars by flooding. The changes in chlorophyll content， specific leaf area， photosynthetic parameters and chlorophyll fluorescence parameters after different flooded days were measured respectively. The results showed that the changing trends of chlorophyll a， chlorophyll b and total chlorophyll were slightly different under flooding stress， and there were no significant changes in Y. ‘（Mag’s） Piroutte’ and Y.stellata ‘Chrysanthemiflora’， while Y.‘Bety’， Y.stellata and Y.‘Judy’ showed a downward trend respectively. The net photosynthetic rate（P_n） showed a downward trend， and the maximum net photosynthetic rate（P_nmax） and light saturation point（LCP） of the treatment groups were significantly lower than those of the control group respectively. The dark respiration rate（R_d） of Y. stellata ‘Chrysanthemiflora’ and Y. ‘（Mag’s）Piroutte’ of the treatment group was higher than that of the control group. The Rd of Y. ‘Bety’， Y. stellata and Y. ‘Judy’ were significantly reduced after flooding treatment to reduce the consumption of photosynthetic products respectively. The effective photochemical quantum yields（Φ_PSⅡ） of Y. ‘（Mag’s）Piroutte’ and Y.‘Judy’ decreased by 8.4% and 24.7% under flooding stress； Y.stellata ‘Chrysanthemiflora’， Y.‘Bety’ and Y.stellata decreased significantly， respectively 76.7%， 85.7% and 64.6%. The maximum photochemical quantum yield（F_v/F_m） of each cultivar of Y.stellata. had a downward trend. The photosynthetic characteristics of Y.stellata andits cultivars were affected by flooding stress， but different cultivars had differences. Except for Y.‘Bety’， the Photosynthesis of the other 4 Y.stellata cultivars performed normally during the 7 d before treatment； Y. ‘（Mag’s）Piroutte’ had strong photosynthetic capacity and waterlogging adaptability. The results provid a theoretical basis for the selection of Y.stellata cultivars suitable for planting in wet and waterlogged areas in southern China.

Key words: Yulania stellata, flooding stress, photosynthesis, light response curve, chlorophyll fluorescence parameters

CLC Number:

S685.15

Xiwu DU, Jun QIN, Kang YE, Yonghong HU, Yiwei TAO, Yongzheng PENG, Yanxiang SHEN, Yan LIANG, Li ZENG. Effects of Flooding Stress on Photosynthetic Characteristics of Yulania stellata and Its Cultivars[J]. Bulletin of Botanical Research, 2022, 42(3): 483-491.

Figures/Tables 6

Fig.1

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Table 1

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品种 Cultivars	处理 Treatment	最大净光合速率 P_nmax /（μmol·m^-2·s^-1）	表观量子效率 Φ /（mol·mol^-1）	光饱和点 L_SP /（μmol·m^-2·s^-1）	光补偿点 L_CP /（μmol·m^-2·s^-1）	暗呼吸速率 R_d /（μmol·m^-2·s^-1）
菊花 Y. stellata ‘Chrysanthemiflora’	对照CK	12.73±0.14A	0.065±0.003BC	493.08±5.22B	13.89±0.08CD	0.90±0.04CD
菊花 Y. stellata ‘Chrysanthemiflora’	淹水处理FL	10.01±0.08B	0.053±0.003CD	308.48±2.45E	18.60±2.13BC	0.99±0.11BC
贝蒂 Y. ‘Bety’	对照CK	7.06±0.09E	0.052±0.005CD	528.44±8.17A	17.27±0.89BC	0.89±0.14CD
贝蒂 Y. ‘Bety’	淹水处理FL	3.91±0.4G	0.038±0.021D	191.18±17.42G	11.88±3.97D	0.39±0.07E
皮鲁埃特 Y. ‘（Mag’s）Piroutte’	对照CK	12.76±0.19A	0.060±0.005BCD	417.06±5.98C	11.64±1.89D	0.70±0.18D
皮鲁埃特 Y. ‘（Mag’s）Piroutte’	淹水处理FL	8.99±0.04C	0.065±0.003BC	347.58±1.71D	10.92±0.67D	0.71±0.08D
星花玉兰 Y. stellata	对照CK	8.96±0.85C	0.081±0.033B	325.44±30.51DE	11.26±5.51D	0.88±0.28CD
星花玉兰 Y. stellata	淹水处理FL	5.87±0.05F	0.047±0.003CD	301.56±2.62E	19.59±1.28B	0.71±0.07D
朱迪 Y. ‘Judy’	对照CK	8.09±0.25D	0.055±0.032CD	321.95±9.02E	25.16±3.24A	1.38±0.05A
朱迪 Y. ‘Judy’	淹水处理FL	7.06±0.01E	0.107±0.001A	256.46±0.19F	11.21±0.03D	1.20±0.02AB

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