Effects of light intensity and amount of supplemental LED lighting on photosynthesis and fruit growth of tomato plants under artificial conditions
Effects of light intensity and amount of supplemental LED lighting on photosynthesis and fruit growth of tomato plants under artificial conditions
复制标题
人工条件下LED补光光强和光量对番茄植株光合作用和果实生长的影响
DOI：
10.2480/agrmet.69.2.5
复制
发表时间：
2013
影响因子：
1.3
通讯作者：
E. Goto
中科院分区：
文献类型：
--
作者：
S. Hikosaka;Soushi Iyoki;M. Hayakumo;E. Goto
研究了光照强度(光合光量子通量[Ppf inμmol.m-·S])和辐照叶片数对番茄个体光合作用和果实生长的影响，以期为温室番茄生产开发配套的发光二极管照明技术。在试验1中，三个PPF水平(P200、P500和P1000)被应用于花后番茄植株，每株修剪成一叶一枝三花。坐果率、叶片和果实干重随PPF的增加而增加，但P500和P1000处理后，叶片出现逆境和伴随的病症。因此，要提高番茄果实和植株的座果率和生长速度，应通过增加辐照叶片数来增加每株植株的总受照量，而不是提高每片叶片的PPF。对于长期栽培，P200是供试处理下每片叶片的最佳PPF。实验2使用标准番茄植株，不去掉叶片或桁架。我们利用同化室研究了接受P200辐射的叶片数对每株(地上部分)光合作用速率(Pn)的影响。LED补光处理单叶和双叶的Pn分别比对照(仅顶光)高12%和28%。因此，在番茄栽培中，可以通过增加接受P200辐射的叶片数来加速光合作用，而不是通过增加PPF来提高果实的生长和产量。
We assessed the effects of light intensity (photosynthetic photon flux [PPF in μmol·m-·s-]) and number of irradiated leaves on photosynthesis and the fruit growth of individual tomato plants to develop supplemental LED lighting techniques for greenhouse tomato production. In Experiment (Exp.) 1, three PPF levels (P200, P500, and P1000) were applied to a post-anthesis tomato plant for three weeks, each plant pruned to have one leaf and one truss with three flowers. The fruit set and leaf and fruit dry-weight increased with increasing PPF; however, after P500 and P1000 treatments, the leaves showed signs of stress and accompanying disorders. Thus, to increase the fruit set ratio and growth rate of tomato fruits and plants, the total amount of irradiation received by each plant should be increased by increasing the number of irradiated leaves, rather than raising the PPF per leaf. For prolonged cultivation, P200 was the optimal PPF per leaf under the tested treatments. Exp. 2 used standard tomato plants with no leaves or trusses removed. We used an assimilation chamber to examine the effect of the number of leaves receiving P200 irradiation on the photosynthetic rate (Pn) per plant (above ground part). The Pn per plant in treatments where one and two leaves were irradiated by supplemental LED lighting were, respectively, 12 and 28% higher than that in the control (only top lighting). Therefore, fruit growth and yields in tomato cultivation may be raised via acceleration of photosynthesis by increasing the number of leaves that receive P200 irradiation rather than by increasing PPF.