摘要
通过盐水灌溉法，研究了长期盐胁迫对4种暖季型草坪草优良新品系沟叶结缕草‘Z123’、结缕草‘Z080’、狗牙根‘C291’，和海雀稗‘P006’生长的影响，以评价其抗盐性及对长期盐胁迫的适应性生长反应。结果表明，根据绿叶盖度和植株总于重，这4种草坪草的抗盐性依次为‘Z123’〉‘P006’〉‘C291’〉‘Z080’。长期的盐胁迫显著抑制了‘Z123，和‘Z080’的叶重、枝条干重和枝条长度，而‘P006’和‘C291’在10～20g／L以上的盐度下才受显著抑制。‘Z123’、‘C291，和‘P006’可以分别在20，10和5g／L以内的盐度下维持稳定的枝条数量，而‘Z080’在5g／L下显著降低。5～10g／L左右的低盐度对4种草坪草地下茎和根系生长的影响不显著，较高盐度下才受显著抑制，但‘P006’，和‘C291’在5g／L下具有更稳定的根系干重。长期盐胁迫不同程度地提高了4种草坪草的地下部分地上部分干重比，但抗盐越弱的草比值增加越快。不同草坪草的同一器官对盐胁迫的反应不一致，反应了其抗盐机制的差异。
The need for saline-tolerant turfgrasses is increasing because of the turfgrass establishment on highly saline soil in arid and seashore regions or the increased utilization of saline water for greenland irrigation. The salinity tolerance and the growth responses of four new selections of warm season turfgrasses （Zoysia matrella） ‘Z123＇, Z. japonica ‘Z080’, Cynodondactylon ‘C291＇, and Paspalum vaginatum ‘P006’） to long-term salt stress were evaluated. Based on green leaf coverage and total dry weight the salinity tolerance of these turfgrasses decreased in the order： ‘Z123＇〉‘P006’〉‘C291＇〉‘Z080’. Leaf weight, dry shoot weight and shoot length of ‘Z123＇ and ‘Z080’ were significantly decreased after long-term salt stress, while those of ‘P006’ and ‘C291’ were not affected until salinities were higher than 10-20 g/L. ‘Z123’,‘C291’ and ‘P006＇ maintained stable shoot numbers under 20, 10 and 5 g/L stress respectively. There was a significant decrease in ‘Z080＇ at 5 g/L stress. Dry rhizome weights and dry root weights of the four turfgrasses were not significantly affected at low salinities （about 5-10 g/L）, however, dry root weight was more stable in ‘C291’ and ‘P006’ at 5 g/L. The ratios of underground biomass to aboveground biomass of the four turfgrasses all increased with increased salinities, a trend that was quicker in lower salinity tolerance turfgrass. The same organs of the four turfgrasses had different responses to salt stress and different mechanisms for salinity tolerance.
出处
《草业学报》
CSCD
2008年第5期30-36,共7页
Acta Prataculturae Sinica
基金
江苏省高技术研究项目(BG2006320)资助
关键词
长期盐胁迫
暖季型草坪草
生长反应
适应性
long-term salt stress
warm season turfgrass
growth response
adaptation
