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园艺学报 ›› 2004, Vol. 31 ›› Issue (4): 477-481.

• 研究论文 • 上一篇    下一篇

基质供水状况对番茄穴盘苗碳氮代谢及生长发育的影响

崔秀敏 王秀峰   

  1. ( 山东农业大学园艺学院,泰安271018; 南京农业大学园艺学院,南京210095)
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2004-08-25 发布日期:2004-08-25

Efects of W ater Supply Status in M edia on C, N M etabolism of TomatoPotting Seedlings and the Relationship with Growth and Development

Cui Xiumin and Wang Xiufeng   

  1. (‘College ofHorticulture,Shandong Agricultural University,Tai'an 271018,China; College ofHorticulture,A'.njing Agri f.tural U~iversity,Nanjing 210095,China)
  • Received:1900-01-01 Revised:1900-01-01 Online:2004-08-25 Published:2004-08-25

摘要: 对番茄穴盘育苗基质进行相对含水量分别为90% 、75% 、60% 、45% 、30% 供水下限处理,
探讨了基质供水状况对番茄碳氮代谢的影响及其与生长发育的关系。结果表明:番茄可溶性糖、还原糖含
量均随供水减少而上升,它们既可作为碳代谢原料又可作为渗透调节物质,其含量增加可以增强逆境适应
能力。淀粉与总碳水化合物积累趋势基本一致,随供水减少而上升。非蛋白氮含量随基质供水减少 上升,
蛋白氮含量则下降。基质供水减少通过改变氮的源库关系,导致生长发育延迟。硝酸还原酶活性的升高并
没有弥补缺水而致的氮素吸收的降低。碳、氮代谢间存在互为消长的关系,供水减少使碳/氮比升高,但发
育程度仍呈现延迟的趋势。75% 和90%供水下限处理的生长势差异较小,且初花期和前期产量较高,可以
作为番茄穴盘苗控水的参考指标

关键词: 番茄, 穴盘苗, 基质, 含水量, 碳氮代谢, 生长发育

Abstract: Tomato potting seedlings were treated under different floor level of water supply in media
(RWC was 90% ,75% ,60% ,45% ,30% respectively),and discussed the relationship between tt1e
changes of C,N metabolic products and development. The main results were as below:soluble sugar and
reduetive sugar usually as carbon metabolic materials and osmotic solutes. increased in lear with water supply
decreasing,whieh enhanced adaptive ability in adversity to keep normal metabolism. Starch content in tomato
leaf increased with less water supply.similar to total carbohydrate change. Relationship of“sink—source’’was
altered under different water supply status.Less water supply made NRA (Nitrate activity)increase signifi—
cantly,yet which could not retrieve N loss due to water deficit.C
, N metabolism was Begative eorrelati0n.
and C/N ratio increased with water supply decreased,while development degree showed delayed trend
. The
first anthesis, sum of earlier three anthotaxy flowers
. and earlier stage yield of the treatment 0f 75% RWC
floor level seedlings were better than which of the treatment of 90% RWC floor leve1. n0 significallt difference
between the above two treatments,SO 75% floor level of wate r·supply could be as referenee for potting seed.
1ings irrigation.

Key words: Tomato, Potting seedlings, Substratum, Water content, C, N metabolism, Growth anddevelopment