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Interactions between root-zone temperature and growth irradiance on stomatal and non-stomatal limitation of photosynthesis of temperate lettuce grown in the tropics

Interactions between root-zone temperature and growth irradi...

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全国植物光合作用、光生物学及其相关的分子生物学学术研讨会

作者： he jie and lee sing kongnatural sciences academic group , national institute of education, nanyang {3. University, 1 nanyang walk, singapore 63. 616 (Email: jhe@nie.edu.sg)

The tropical climate of singapore,which is non-seasonal,hot and humid,is notsuitable for growing temperate ***,we have successfully grown thetemperate lettuce（Lactuca sativa L.）in the tropics by exposing the roots to cooltemperatures（15 to 25℃）while shoots were maintained at hot ambient *** this study,aerial parts of lettuce were grown under natural tropical fluctuatingambient temperatures but with their roots exposed to two different root-zonetemperatures（RZTs）:a constan 20℃-RZT and a fluctuating ambient（A-）RZT from23. to 40℃.On a sunny day,photosynthetic CO assimilation（A）and stomatalconductance（g）increased with photosynthetic photon flux density（PPFD）duringthe morning,declined at midday and partially recovered durig mid-afternoon（14.00h-16.00 h）before decreasing with PPFD during the late *** diurnalpatterns occurred in both 20℃-RZT and A-RZT plants although A and g in A-RZTplans were significatly *** midday depressions of A and g in A-RZT

关键词： Interactions between root-zone temperature and growth irradiance on stomatal and non-stomatal limitation of photosynthesis of temperate lettuce grown in the tropics

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Root Morphology, Plant Growth, Nitrate Accumulation and Nitrogen Metabolism of Temperate Lettuce Grown in the Tropics with Elevated Root-Zone CO₂ at Different Root-Zone Temperatures

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American Journal of Plant sciences 2016年第14期7卷 1821-1833页

作者： jie he Lin Qin sing Kong {3. Natural sciences and Science education academic {3. National Institute of Education Nanyang Technological University Singapore

This paper investigated the effects of root-zone (RZ) CO2 concentration ([CO2]) on root morphology and growth, nitrate (NO3.) uptake and assimilation of lettuce plants at different root-zone temperatures (RZT). Elevat... 详细信息

This paper investigated the effects of root-zone (RZ) CO2 concentration ([CO2]) on root morphology and growth, nitrate (NO3./sub>-) uptake and assimilation of lettuce plants at different root-zone temperatures (RZT). Elevated RZ [CO2] stimulated root development, root and shoot growth compared to ambient RZ [CO2]. The greatest increase in root growth was observed in plants grown under elevated RZ [CO2] of 50,000 ppm. However, RZ [CO2] of 10,000 ppm was sufficient to achieve the maximal leaf area and shoot productivity. Lettuce plants exhibited faster shoot and root growth at 20°C-RZT than at ambient (A)-RZT. However, under elevated RZ [CO2], the magnitude of increased growth was greater at A-RZT than at 20°C-RZT. Compared to RZ [CO2] of 3.0 ppm, elevated RZ [CO2] of 10,000 ppm increased NO3./sub>- accumulation and nitrate reductase activity (NRA) in both leaves and roots. NO3./sub>- concentrations of leaf and root were higher at 20°C-RZT than at A-RZT in all plants. NRA was higher in root than in leaf especially under A-RZT. The total reduced nitrogen (TRN) concentration was significantly higher in plants grown under elevated RZ [CO2] of 10,000 ppm than under ambient RZ [CO2] of 3.0 ppm with greater concentration in 20°C-RZT plants than in A-RZT plants. These results imply that elevated RZ [CO2] significantly affected root morphology, root and shoot growth and N metabolism of temperate lettuce with greater impacts at A-RZT than at 20°C-RZT. These findings have practical significance to vegetable production by growing the vegetable crops at cool-RZT with elevated RZ [CO2] to enhance its productivity.

关键词： Lettuce Nitrate Assimilation Nitrate Uptake Root Morphology Root-Zone CO2 Root-Zone Temperature

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