盐胁迫对番茄幼苗热值、能量积累及分配的影响

研究了基质盐度(0、80、160、240 mmol/L NaCl)对番茄(Lycopersicon esculentumMill.)幼苗热值和能量积累的影响.结果表明:番茄幼苗干物质和能量积累存在低盐促进和高盐抑制的现象,最大值出现在80 mmol/L NaCl处,干物质为6.39 g,能量积累达92.20 kJ.随基质盐度升高,干物质和能量积累倾向于叶片中.番茄幼苗干质量热值和去灰分热值存在不同的变化规律.随盐度升高,根干质量热值和去灰分热值显著增加,而在茎叶和整个植株中,干质量热值逐渐下降,去灰分热值最大值则出现在80 mmol/L NaCl处.

Effect of Salinity on Caloric Value, Energy Accumulation and Partitioning in Lycopersicon esculentum var. cerasiforme Alef. Seedlings

To study the effect of salinity on caloric value and energy accumulation in crop plant,tomato(Lycopersicon esculentum var.cerasiforme Alef.) seedlings were cultivated in sand medium with half strength Hoagland's solution containing 0,80,160,240 mmol/L NaCl respectively.After fifty days,dry matter and energy accumulation exhibited significant increase in response to low NaCl concentration(80 mmol/L),but decreased under high salinity level(160,240 mmol/L),with maximum dry matter 6.39 g,energy 92.20 kJ per seedling.As salt concentration increased,dry matter and energy,the percentages to total seedlings decreased in roots and stems,while increased in leaves,suggesting that dry matter and energy tended to be re-allocated to leaves.The changes of gross caloric value(GCV) and that of ash-free caloric value(AFCV) were not coincident in L.esculentum var.cerasiforme Alef.seedlings.In roots,GCV and AFCV increased markedly.But in leaves,stems and total seedling,GCV declined progressively and AFCV maximized at 80 mmol/L NaCl.