Barnes C, Bugbee B
Department of Plants, Soils, and Biometeorology, Utah State University, Logan 84322-4820, USA.
Plant Physiol. 1991;97(1):359-65. doi: 10.1104/pp.97.1.359.
Wheat plants (Triticum aestivum L.) were grown at the same photosynthetic photon flux (PPF), 200 micromoles per square meter per second, but with phytochrome photoequilibrium (phi) values of 0.81, 0.55, and 0.33. Plants grown at phi values of 0.55 and 0.33 tillered 43 and 56%, less compared with plants grown at phi of 0.81. Main culm development (Haun stage) was slightly more advanced at lower values of phi, and leaf sheaths, but not leaf lamina, were longer at lower phi. Dry-mass accumulation was not affected by different levels of phi. Three levels of PPF (100, 200, and 400 micromoles per square meter per second) and two lamp types, metal halide and high pressure sodium, were also tested. Higher levels of PPF resulted in more dry mass, more tillering, and a more advanced Haun stage. There was no difference in plant dry mass or development under metal halide versus high pressure sodium lamps, except for total leaf length, which was greater under high pressure sodium lamps (49.5 versus 44.9 centimeters, P < 0.01).
小麦植株（普通小麦）在相同的光合光子通量（PPF）下生长，即每秒每平方米200微摩尔，但光敏色素光平衡（phi）值分别为0.81、0.55和0.33。与在phi值为0.81条件下生长的植株相比，在phi值为0.55和0.33条件下生长的植株分蘖分别减少了43%和56%。在较低的phi值下，主茎发育（豪恩阶段）略为提前，并且在较低的phi值下叶鞘（而非叶片）更长。干物质积累不受不同phi水平的影响。还测试了三种PPF水平（每秒每平方米100、200和400微摩尔）以及两种灯型，即金属卤化物灯和高压钠灯。较高水平的PPF导致更多的干物质、更多的分蘖以及更高级的豪恩阶段。除了总叶长在高压钠灯下更长（49.5厘米对44.9厘米，P<0.01）之外，在金属卤化物灯和高压钠灯下，植株的干物质或发育情况没有差异。
