红蓝光质配比对观光木苗木生长及内源激素的影响

Effects of Red and Blue Light Ratio on Growth and Endogenous Hormone Synthesis of Tsoongiodendron odorum Seedlings

以2个月生观光木幼苗为试验材料,用LED灯的红蓝单色光及红蓝不同配比的复合光处理观光木幼苗;以纯白光为对照,进行为期120 d的试验,测定不同光质下观光木的苗高、地径、生物量及GA_(3)、ABA、IAA、ZR的含量。结果表明:苗高和地径生长量在纯蓝光处理下最高,在纯红光处理下最低,且随着复合光中蓝光比例的不断增加,苗高和地径生长量也显著增大;苗木的根、茎、叶干物质积累量和苗木总干质量均在纯蓝光和蓝光比例最高的复合光下达到最高值,在纯红光和红光比例最高的复合光处理下最低;GA_(3)和ZR含量在纯蓝光处理下均较高,ABA含量则在纯红光处理下最高,在纯红光中添加适宜比例的蓝光有利于减少抑制类激素ABA的合成,从而促进苗木的生长发育;苗木的综合质量在纯蓝光处理下表现最佳,且随着蓝光比例的增加苗木质量呈现出更好的趋势。可见,纯蓝光处理促生效果最佳,能最大程度的提高干物质积累量,提高观光木幼苗品质及生长速率;红光能促进叶片中ABA的合成,对苗木生长存在抑制作用。虽然纯蓝光处理下苗木高径比和质量指数最高,但红蓝光按照适宜比例搭配照射苗木可以更好的调节观光木苗中内源激素之间平衡合理的比例关系,更有利于提升苗木的综合质量,缩短其培育周期,从而更高效率地培育高品质观光木幼苗。

Taking 2-month-old seedlings of Tsoongiodendron odendron as experimental materials,the seedlings were treated with red and blue monochromatic LED(light emitting diode)lights and composite LED lights.The experiment lasted for 120 days with pure white light as control.The seedling height,ground diameter,biomass and the content of GA_(3),ABA,IAA,ZR were measured under different light quality.The findings indicated that the growth of seedling height and ground diameter was the highest under pure blue light treatment and the lowest under pure red light treatment,and the growth of seedling height and ground diameter increased significantly with the increase of blue light ratio in compound light;the dry matter accumulation of roots,stems and leaves and the total dry weight of seedlings reached the highest value under the pure blue light and the compound light with the highest proportion of blue light,and the lowest value under the compound light with the highest pro-portion of red light and pure red light;the content of GA_(3) and ZR were higher under pure blue light treatment,while the content of ABA was the highest under pure red light treatment.Adding the appropriate proportion of blue light to pure red light was conducive to reduce the synthesis of ABA,and promote the growth and develop-ment of seedlings;the best comprehensive quality of seedlings appeared under pure blue light treatment,and with the increase of the proportion of blue light,the quality of seedlings showed a better trend.In summary,pure blue light treatment had the best growth promoting effect,which could increase the dry matter accumulation,improve the seedling quality and growth rate;red light could promote the synthesis of ABA in leaves and inhibit the growth of seedlings.Although the H/D and SQI under pure blue light treatment were the highest,the appropriate proportion of red and blue light combined with irradiation of seedlings could better regulate the balance between endogenous hormones in seedlings,which was more conducive to improve the comprehensive quality of seed-lings,shorten the cultivation period,and cultivate high-quality seedlings more efficiently.