不同比例红蓝光对烟苗生长及碳氮代谢的影响

The Effect on Different Proportion of Red Blue Light to Growth and Carbon and Nitrogen Metabolism of the Tobacco Seedling

为探索湖南冬季烤烟漂浮育苗补光技术,研究不同比例红蓝光对烟苗根系和叶片生长及主要碳氮代谢产物及酶活性的影响。试验分别采用蓝光与红光1：3、1：1、3：1比例组合的LED灯,并且与日光灯组合成不同照光强度光源对烟苗进行光照处理。研究结果表明,光质和照光强度对烟苗的出叶时间影响不大;照光强度达到7200lx以上且红光：蓝光比为3：1时,烟苗生长最好。红光：蓝光为3：1有利于叶片叶绿素的合成及生长,而红光：蓝光为1：3可促进根系生长和根系活力提高。组合光源光照下蓝光强度占总照光强度的5%~15%时,对烟苗的茎的作用尤为明显。随着照光强度增加,组合光源中红光：蓝光为3：1处理的烟苗叶片可溶性总糖含量和转化酶活性显著提高;组合光源中红光：蓝光为1：3处理烟苗叶片的蛋白质含量和硝酸还原酶活性显著提高。光质及光照强度对烟苗叶绿素合成、碳氮代谢具有十分灵敏的调节作用。合理光照可促进烤烟幼苗根系与叶片的生长。

light supplement technology by floating seeding of flue-cured tobacco in winter in Hunan, it was studied for effect on different proportion of red blue to growth of root and leaf and carbon and nitrogen metabolism and enzyme activity of the tobacco seeding. Tests were separately carried out with the light emitting diodes in proportion of blue：red 1：3, blue：red 1：1 and blue：red 3：1, and they were combined into different light intensity of light source of tobacco seeding by fluorescent light. The results showed that light quality and light intensity on the tobacco leaf time had little effect, and the growth of tobacco seedings were best when light intensity reaches above 7200 lx and the proportion of red：blue 3：1. The proportion of red：blue 3： 1 could promote chlorophyll synthesis and growth of tobacco seeding, but the proportion of red：blue 1：3 could affect the growth of root and increase root activity. Blue light intensity of the total light intensity between 5% and 15% in the combined light significantly promoted the growth of the stem of tobacco seeding. With the increasing of light intensity, the processing leaf of tobacco seeding of the proportion of red：blue 3：1 incombination source could significantly increase total soluble sugar content and enzyme activity, and the processing leaf of tobacco seeding of the proportion red：blue 1：3 in combination source could significantly increase protein content and nitrate reductase activity. Light quality and light intensity on chlorophyll synthesis and carbon and nitrogen metabolism of tobacco seeding highly had sensitive regulation. Reasonable compensation could promote the growth of root and leaf of flue-cured tobacco seeding.