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番茄不同品种幼苗对低温弱光生理适应的差异 总被引:1,自引:1,他引:1
研究了低温弱光对5个番茄品种苗期生长的影响,并对不同品种耐低温弱光性能进行了比较。结果表明:低温弱光下番茄幼苗的生长量、叶片叶绿素含量、光合速率(Pn),根系活力与细胞质膜相对透性变化,不同品种表现差异明显。以黄洋梨耐低温弱光能力较强,红洋梨、红樱桃耐低温弱光能力较弱。 相似文献
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为了解合肥地区春季大棚内的光温环境,筛选番茄耐低温弱光的指标,为选择适于该地区大棚栽培的番茄品种提供依据.通过对2008年3~4月份大棚内外温度、光照的观测和大棚内不同番茄品种的栽培试验,研究了大棚内外的光温环境,低温弱光对13个不同番茄品种苗期的叶片叶绿素含量、净光合速率大小、MDA含量和SOD活性的影响.结果表明,春季大棚内温度在20℃左右、比棚外平均高5℃左右,大棚内光强平均为20 000 1x.多云或者阴雨天,大棚内出现低温弱光环境.不同番茄品种叶绿素含量不同,美洲豹、天福168叶绿素含量高,天福501净光合速率大,与其低温弱光的适应性一致.低温弱光处理对不同番茄品种叶片MDA的含量和SOD活性的影响不同.天福501、天福168番茄MDA显著低于对照、SOD活性则显著高于对照.文章对低温弱光环境与番茄耐低温弱光指标进行了讨论.指出苗期番茄叶片叶绿素含量水平和低温弱光下MDA含量是选择耐低温弱光番茄品种筛选的重要参考指标. 相似文献
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低温弱光对黄瓜植株生长、光合特性的影响 总被引:7,自引:0,他引:7
研究了偏低温弱光条件对5个黄瓜品种苗期植株下胚轴、真叶数、叶长叶宽、叶绿素含量、净光合速率及叶绿素光化学效率的影响。结果表明,偏低温弱光造成黄瓜下胚轴、真叶数以及叶长叶宽的生长量减少,叶片的叶绿素含量、净光合速率和叶绿素光化学效率降低。不同品种受低温弱光逆境影响的部位和程度不同。 相似文献
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光合特性作为番茄设备专用品种选育指标的效应 总被引:8,自引:1,他引:8
利用6个不同特性的番茄品种,分别在两层覆盖连栋大棚、单层覆盖连栋大棚及现代化加温玻璃温室等3种不同设施条件下,对不同番茄品种在低温弱光下叶片中的叶绿素含量、叶绿素荧光指数及净光合作用率的变化进行了研究。结果表明,可以用叶征中叶绿素含量在低弱光下的变化趋势作为设施专用番茄品种选育的筛选指标之一,耐低温弱光的品种在低温弱光下叶片中叶绿素的含量呈上升趋势;净光合作用曲线可以作为选育设备番茄品种的一个比较理想的群体指标;叶绿素荧光指数不宜作为品种选育的耐低温弱光指标。 相似文献
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研究了低温弱光对3个砧木嫁接黄瓜苗期生理特性的影响,并对不同砧木嫁接黄瓜的耐低温弱光性能进行了比较.结果表明:低温弱光下,SOD活性先降低后升高,POD活性呈上升-下降-上升的趋势,MDA和脯氨酸含量增加,植株生长减缓,叶绿素含量降低,净光合速率下降.不同砧木嫁接黄瓜幼苗的生理适应不同,以黑籽南瓜嫁接黄瓜耐低温弱光能力最强,凤凰一号次之,据金龙最低. 相似文献
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利用叶绿素荧光参数评价番茄耐低温弱光能力的研究 总被引:4,自引:0,他引:4
为了利用叶绿素荧光参数区分不同番茄品种的耐低温弱光能力,以5个番茄品种为试材,测定亚低温弱光处理5、10、15 d的叶绿素荧光参数和15 d的抗性指数(TIVG)。结果表明,亚低温弱光处理10 d,ΦPSII、q P和P值3个叶绿素荧光参数都可以将5个番茄品种最大程度地区分为3种耐低温弱光类型,结合叶绿素荧光参数与TIVG的相关性分析,ΦPSⅡ、q P、P值与TIVG相关系数均为0.85,呈显著正相关。因此,通过测定番茄幼苗亚低温弱光处理10 d的3种叶绿素荧光参数,可以将批量番茄种质的耐低温弱光能力在一定程度上区分为不同的类型,为番茄耐低温弱光鉴定和评价提供参考。 相似文献
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黄瓜幼苗耐低温指标研究初报 总被引:19,自引:0,他引:19
通过研究低温对黄瓜幼苗的影响,发现在低温条件下,黄瓜幼苗叶片叶绿素含量明显下降,其相对减少量与黄瓜耐低温能力呈负相关;大部分品种(系)可溶性蛋白质含量增加,低温下可溶性蛋白质含量及相对增加量与黄瓜耐低温能力表现为正相关。在低温条件下保持较高的叶绿素含量和NR活性是黄瓜植株保持较大生长量的基础。经相关分析,NR活性及其相对减少量与黄瓜耐低温能力呈显著相关,是鉴定黄瓜耐温能力的较好指标。并对植物耐低温能力的复杂性做了分析。 相似文献
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低温弱光对温室番茄生理特性的影响 总被引:55,自引:0,他引:55
研究了番茄初花期低温弱光逆镜对叶片膜保护酶(SOD)活性,膜脂过氧化产物MDA含量、叶绿素a荧光诱导动力学参数Fv/Fm值和内源激素水平的影响。结果表明,叶片内源激素水平对低温弱光的反应随品种和处理强度不同而有较大差异。低温弱光处理后,SOD活性显著下降,MDA含量明显增加;荧光参数Fv/Fm值增加,碳同化活性降低,影响程度取决于品种和低温弱光强度。毛粉802比Skala耐低温,而Skala则比毛粉802更耐弱光。 相似文献
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以耐盐性差异显著的两个品种京丹5号和小圆枣为试材,研究了不同盐胁迫时间对樱桃番茄幼苗生理指标的影响。结果表明,204 mmol/L的NaCl胁迫10、15 d时,不同品种相对电导率的差异更为明显,易于区分樱桃番茄品种的耐盐性。 相似文献
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The dynamics of chlorophyll content, leaf area and photosynthesis of cucumber seedlings were studied under sole stress of two low temperatures and low light intensity as well as combined stresses of low light intensity and the two low temperatures. The results showed that low light intensity reduced sensitivity of cucumber to low temperature and improved chlorophyll content, leaf area and chlorophyll fluorescence quantum yield. The photosynthesis rate was reduced under low light intensity. The intensity of light played the leading role in growth of cucumber under the low temperature condition, while the low temperature played the leading role under the critical low temperature condition. There were differences in reaction to light and temperature among different varieties. The tolerance to low temperature and low light intensity was not always synergetic for the same cucumber variety. 相似文献
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XU Shu LI Ling ZHANG SiMeng CAO RuXia CHEN LingLing CUI Peng Lü ZunFu WU LieHong LU GuoQuan 《中国农业科学》2019,52(17):2929-2938
【Objective】 It is of great significance to explore the low temperature tolerance mechanism of sweet potato seedlings and identify the key factors affecting the low temperature tolerance of the seedlings for evaluation and screening of cold tolerance genetic resources of the seedlings and research on the mechanism of low temperature tolerance of sweet potatoes.【Method】 In order to investigate the cold tolerance of different varieties of sweet potato seedlings, 30 varieties of sweet potato seedlings were selected and tested under low temperature conditions of 4℃ in this study, their physiological indexes and antioxidant enzyme indexes were measured so as to observe the effects of low temperature stress on physiological characteristics of sweet potato seedlings. The low temperature tolerant sweet potato varieties were screened by the subordinate function analysis of the physiological characteristics of sweet potato seedlings.【Result】 Great difference of the physiological indexes of 30 different genotypes of sweet potato seedlings were found under low temperature stress. After low temperature stress the relative electrical conductivity and proline contents of all sweet potato seedlings were increased to different extents. The relative conductivity of Sushu 16 changed the most, up to 40.16%, and the most increased proline content was Liaoshu 15 up to 3.66 μg·g -1 FW; malondialdehyde (MDA), superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), Ascorbate peroxidase (APX) showed an upward trend; among the 30 varieties of potato seedlings, the most significant change in MDA content was Suyu 303; the SOD activity of all sweet potato seedlings increased, and the most variable SOD activity was Yushu 17. The change before and after stress was as high as 27.59 U·g -1 FW, but Ningzishu 1, Shangxuzi 1 and Ziluolan seedlings were in a state of wilting and death, and the change of SOD activity showed a negative value; the POD activity of all potato seedlings showed an upward trend. The highest change in POD activity was Gan 10-20, up to 29.21 U·(g·min) -1, and the change of POD content in Ziluolan was negative; the highest increase in CAT activity was Hongxiangjiao; The change of APX activity showed an upward trend, and the potato 25, Hongxiangjiao and Longzishu 6 greatest change, Pu 32, Shangshu 8, Ziluolan the minimum change; proline content is increased up to Liao 15, up to 3.66, It is 1.5 times that of Shangxuzi 1. Correlation analysis of physiological indexes of sweet potato seedlings showed that relative conductivity and MDA content were negatively correlated with cold tolerance of sweet potato seedlings. SOD, POD, CAT and APX activities were positively correlated with cold tolerance of sweet potato seedlings, proline content and cold tolerance of sweet potato seedlings. Sexuality is positively correlated.【Conclusion】 Comprehensive conductivity and antioxidant enzymes and proline indicators, according to membership function analysis. Different varieties of sweet potatoes were different in low temperature resistance. At the temperature of 4℃, the order of low temperature resistance of all sweet potatoes was: Longshu515>Gan10-20>Nanshu010>Hongxiangjiao>Guangshu87>Sushu8>Yushu17>Longzishu6>Yanshu25>Zheshu13>Yizhi138>Sweet potato 166-7>Qingzishu2>Xushu55-2>Liaoshu19>Liaoshu15>Longshu14>Xushu22>Shangshu19>Pushu32>Ningzishu2>Longshu9>Shangshu8>Xuzishu8>Hongdong>Sushu16>Taiwanyingou>Shangxuzishu1>Suyu303>Ziluolan. 相似文献
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低温弱光对茄子幼苗生理特性的影响 总被引:12,自引:2,他引:12
以4~5叶二苠茄、快圆茄、兰杂5号茄子为试材, 研究了茄子幼苗在低温(10 /5 和20 /10 )弱光(454.5 祄olm-2s-1)处理下净光合速率(Pn)的变化及对其生理特性的影响。结果表明:低温弱光胁迫处理后茄子幼苗的Pn降低;POD活性和MDA含量上升,不同品种受低温弱光逆境影响的程度不同。 相似文献