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首页> 外文期刊>Russian Agricultural Sciences >Effects of Root-Zone Temperature on Growth, Chlorophyll Fluorescence Characteristics and Chlorophyll Content of Greenhouse Pepper Plants Grown under Cold Stress in Southern China
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Effects of Root-Zone Temperature on Growth, Chlorophyll Fluorescence Characteristics and Chlorophyll Content of Greenhouse Pepper Plants Grown under Cold Stress in Southern China

机译：南方冷应力下变种温室辣椒植物生长，叶绿素荧光特性和叶绿素含量的影响

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In Southern China, plants are usually exposed to cold stress during winter in an unheated greenhouse, but due to the high energy consumption and costs, most of the greenhouses remain unheated. In an attempt to find a simple and affordable solution to this problem, this study was undertaken. In this research, Capsicum frutescens L. plants were studied to investigate the effect of different root zone temperatures on its growth and chlorophyll fluorescence characteristics under cold stress. The plants were cultivated under cold stress conditions in a root zone temperature (RZT) control system where the roots were subjected to four different root-zone temperature treatments of 20°C-T20, 25°C-T25, 45°C-T45 and a control CK group. Growth characteristics studied included plant height, stem diameter, plant width, root length, biomass accumulation. Whilst fluorescence characteristics investigated were chlorophyll fluorescence ratio F ~(v)/ F ~(m), photochemical quenching (qL), efficiency of Photosystem II (Y[II]) and electron transport rate (ETR). Chlorophyll content in the leaves of the plants was also investigated. The findings demonstrated that plants in the CK group suffered a detrimental effect on the growth characteristics registering the lowest values in the measured variables. Conversely, the highest values were observed in T25 RZT treatment. In fluorescence characteristics, values of F ~(v)/ F ~(m)were maintained at between 0.8 and 0.83 but also suffered a photo-inhibitory depression in CK and T45 RZT treatments to F ~(v)/ F ~(m)values of <0.79. This depicted that root zone heating protected the PS II of these plants from photoinactivation induced by cold stress. Similar trends were seen in the qL, Y[II], ETR values with the T20 and T25 treatments registering the highest values. Chlorophyll content was significantly higher in the leaves of the plants in the T20 and T25 group. The lowest chlorophyll content was recorded in the CK group. Plants in all the treatments accumulated more biomass in the shoot than in the roots as depicted by a significantly lower shoot to root ratio values with the exception of those in the CK group. The findings of this study suggest that pepper plants can successfully be grown in an unheated greenhouse in the Yangtze River Delta area of Southern China during winter by heating the root zone of the plants to a RZT value of 25°C, thereby providing a simple, affordable and cost-effective technique.
机译：在中国南方，植物通常在冬季暴露在一个未加热的温室中的冷应力，但由于能量消耗和成本高，大多数温室都仍然未加热。试图找到一个简单而实惠的解决问题，这项研究进行了。在本研究中，研究了Capsicum Frutescens L.植物，研究了不同根带温度对冷应力下的生长和叶绿素荧光特性的影响。在根区温度（RZT）控制系统中在冷应激条件下培养植物，其中根部经受20°C-T20,25°C-T25,45°C-T45的四种不同的根区温度处理。一个控制CK组。研究的生长特征包括植物高度，茎直径，植物宽度，根长，生物质积累。虽然所研究的荧光特性是叶绿素荧光比F〜（v）/ f〜（m），光化学淬火（q1），光照效率II（Y [II]）和电子传输速率（ETR）。还研究了植物叶片中的叶绿素含量。研究结果表明，CK组中的植物对注册测量变量中最低值的生长特性遭受了不利影响。相反，在T25 RZT治疗中观察到最高值。在荧光特性中，将f〜（v）/ f〜（m）的值保持在0.8和0.83之间，但在ck和t45 rzt治疗中也遭受了光抑制抑制作用于f〜（v）/ f〜（m） <0.79​​的值。这描绘了根区加热保护这些植物的PS II免受冷应力诱导的光灭活。在QL，Y [II]，ETR值中看到了类似的趋势，具有记录最高值的T20和T25处理。 T20和T25组中植物的叶片叶绿素含量显着高。在CK组中记录了最低叶绿素含量。所有治疗中的植物在射击中积累了更多的生物量，而不是在根部比下降到根比值的根中，除了CK组中的比例。本研究的结果表明，通过将植物根区域加热到25°C的RZT值，辣椒植物可以成功地在中国南部长江三角洲地区的长江三角洲地区的温室成功生长。从而提供简单的，实惠且经济高效的技术。

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