Amelioration of detrimental effects of waterlogging by foliar nutrient sprays in barley
Amelioration of detrimental effects of waterlogging by foliar nutrient sprays in barley
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DOI：
10.1071/fp06158
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发表时间：
2007-01-01
影响因子：
3
通讯作者：
Shabala, Sergey
中科院分区：
文献类型：
--
作者：
Pang, Jiayin;Ross, John;Shabala, Sergey
以6个耐涝性比较差的大麦品种为研究对象，在温室条件下进行了2周的涝渍处理。在所有品种中，叶面喷施营养剂（四分之一或全部浓度的霍格兰溶液）均能显著缓解涝渍的不良影响。营养喷雾的有益效果包括促进茎和根生长，减少叶片衰老。与未添加叶面养分的淹水植物相比，叶绿素含量、净CO2同化、PSII光化学效率和不定根产量均有所增加。生长素在涝渍植物茎基部积累，喷施叶面营养液显著增加了涝渍植物茎基部生长素积累。叶面施用1-NAA也促进了不定根的产生。生长素在茎-根交界处上方1.2 ~ 1.6 cm处含量最高。叶面施养分也能提高茎部和根部的氮、钾含量，但对钙含量影响不大。综上所述，叶面养分喷施对涝渍植物生长的改善可能与改善植物营养和增加茎基部生长素积累有关，而茎基部生长素是负责不定根发育的物质。
Six barley (Hordeum vulgare L.) cultivars contrasting in their waterlogging tolerance were subjected to waterlogging for 2 weeks under glasshouse conditions. The adverse effects of waterlogging were significantly alleviated by the foliar spray of nutrients (quarter- or full-strength Hoagland solution) in all cultivars. Beneficial effects of nutrient sprays included improved shoot and root growth and reduced leaf senescence. Chlorophyll content was increased, as was net CO2 assimilation, photochemical efficiency of PSII, and adventitious root production compared with waterlogged plants with no added foliar nutrients. Auxin was found accumulated at the shoot base in waterlogged plants, and the spray of foliar nutrients significantly increased this accumulation in waterlogged plants after 14 days of treatment. Foliar application of 1-NAA also promoted the production of adventitious roots. The highest concentration of auxin was measured in the stem region between 1.2 and 1.6 cm above the shoot-root junction. Foliar nutrient application also improved nitrogen and potassium content in both shoot and root, but calcium content was hardly affected. It is concluded that the improvement of waterlogged plant growth by foliar nutrient sprays could be related to both the improved plant nutrition and increased auxin accumulation in the shoot base, responsible for development of adventitious roots.