UV-B辐射增强对甘薯光合特性和紫外吸收物质的影响

doi:10.16035/j.issn.1001-7283.2019.05.019

摘要/Abstract

摘要：

为探索UV-B辐射增强对甘薯光合特性和紫外吸收物质含量的影响,以徽薯为试验材料,以自然光为对照,设2个UV-B辐射增强处理[在自然光基础上增加UV-B辐射3.6和7.2kJ/(m ²·d)分别编号为T1、T2处理],测定不同辐射强度下光合色素含量、光合作用参数和紫外吸收物质含量。结果表明：叶绿素a（Chla）、叶绿素b（Chlb）、类胡萝卜素（Car）和叶绿素a/b的值均随UV-B辐射强度的增加而降低,且Chla、Chlb和Car分别在处理第100、80和40天时对辐射变化最敏感;净光合速率（P_n）显著下降,气孔导度（G_s）降低,胞间CO₂浓度（C_i）和蒸腾速率（T_r）无明显变化规律,气孔限制值（L_s）的变化趋势与C_i相反;紫外吸收物质显著升高,呈CK

关键词: UV-B, 甘薯, 光合特性, 紫外吸收物质

Abstract:

To explore the effects of UV-B enhancement on photosynthetic characteristics and UV-absorbing compounds contents of sweet potato. Using ‘Huishu’ as the test material and the natural light as a comparison, two treatments were added UV-B 3.6kJ/(m ²·d) (T1) and 7.2kJ/(m ²·d) (T2) on the basis of the natural light, respectively. The photosynthetic pigment contents, photosynthetic parameters and UV-absorbing compounds contents were examined under the different radiations. The results showed that: the contents of chlorophyll a (Chla), chlorophyll b (Chlb), carotenoid (Car) and chlorophyll a/b all decreased with the increase of the UV-B intensity. The Chla, Chlb and Car were the most sensitive to the intensity changes at 100th, 80th and 40th day, respectively. The net photosynthetic rate (P_n) decreased significantly, stomatal conductance (G_s) increased first and then decreased, intercellular carbon dioxide concentration (C_i) and transpiration rate (T_r) showed no obvious variation, while stomatal limitation (L_s) showed an opposite trend with C_i. The UV-absorbing compounds were significantly increased, showing a trend of CK

Key words: UV-B, Sweet potato, Photosynthetic characteristics, UV-absorbing compounds

孟凡来,郭华春. UV-B辐射增强对甘薯光合特性和紫外吸收物质的影响[J]. 作物杂志, 2019 (5): 114–119

Meng Fanlai,Guo Huachun. Effects of Enhanced UV-B on Photosynthetic Characteristics and UV-Absorbing Compounds of Sweet Potato[J]. Crops, 2019(5): 114–119

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指标Index	处理 Treatment	处理时间Treatment time (d)
指标Index	处理 Treatment	20	40	60	80	100
P_n [μmol CO₂/(m²·s)]	CK	25.25±1.16a	22.11±1.28a	29.51±2.47a	19.19±1.69a	19.91±1.95a
	T1	22.71±1.88b	19.24±0.78b	17.14±1.73b	15.70±0.88b	12.35±0.25b
	T2	18.79±1.03c	15.74±1.24c	16.62±1.55b	13.62±1.45b	11.97±1.45b
G_s [mol H₂O/(m²·s)]	CK	0.45±0.05b	0.74±0.07a	0.35±0.05b	0.27±0.03b	0.19±0.02b
	T1	0.39±0.02b	0.77±0.06a	0.46±0.04a	0.32±0.01a	0.11±0.00c
	T2	0.62±0.04a	0.50±0.06b	0.32±0.04b	0.28±0.03ab	0.25±0.02a
C_i [mol H₂O/mol]	CK	266.98±9.81b	321.28±7.10a	226.58±13.19c	253.96±14.11b	228.00±15.71b
	T1	253.86±16.02b	320.71±5.31a	298.49±13.23a	280.80±12.78a	200.99±5.69c
	T2	320.67±5.58a	310.95±10.47a	275.22±7.18b	286.03±15.08a	305.11±5.29a
T_r [mmol H₂O/(m²·s)]	CK	11.74±0.58a	8.70±1.20a	9.97±2.05ab	8.82±0.79a	3.86±0.72b
	T1	10.02±1.07b	9.24±0.40a	10.74±0.90a	8.73±0.64a	2.39±0.05c
	T2	12.35±1.08a	7.43±0.47b	8.11±0.22b	8.41±1.22a	5.68±0.30a
L_s	CK	0.29±0.02a	0.16±0.01ab	0.54±0.07a	0.36±0.03a	0.47±0.06b
	T1	0.33±0.04a	0.14±0.01b	0.22±0.02b	0.27±0.04b	0.53±0.01a
	T2	0.17±0.01b	0.17±0.01a	0.27±0.02b	0.26±0.04b	0.23±0.01c