Green-sprouting potato seed tubers in light and elevated temperatures are vital for production in short-season climates. Using light-emitting diodes (LEDs) to inhibit sprout elongation during pre-sprouting may represent an energy-efficient alternative to traditional indoor light sources. Sprout growth inhibition and some photomorphogenic responses were therefore examined in potato cultivars exposed to LEDs of different wavelength maxima and irradiance rates. Red LED (660 nm) produced the strongest inhibition of sprout elongation at very low irradiances 10–100 nmol m−2 s−1, while far-red LED (735 nm) produced the strongest inhibition at higher irradiances. This inhibitory pattern was similar in all cultivars, although the degree of inhibition varied. The colour of sprouts and tuber skin remained etiolated under far-red LED, in contrast to LEDs between 380 and 660 nm which developed green colour intensity in an irradiance-dependent manner. Mixtures of red and far-red light, and pulses including red/far-red reversals did not produce stronger inhibition, except in some instances where total fluence was increased. Furthermore, green-sprouting under different LED colours did not seem to affect subsequent emergence and growth after planting. The current results suggest an involvement of multiple phytochromes in de-etiolation and sprout growth inhibition in seed potato tubers, which may be selectively utilised in LED-based green-sprouting in red and far-red wavelengths.

中文翻译：

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不同 LED 光色下马铃薯种薯 (Solanum tuberosum L.) 萌芽生长抑制及光形态发育

在光照和高温下发绿芽的马铃薯种子块茎对于短季节气候的生产至关重要。在预发芽期间使用发光二极管 (LED) 抑制发芽伸长可能是传统室内光源的节能替代品。因此，在暴露于不同波长最大值和辐照率的 LED 的马铃薯品种中检查了芽生长抑制和一些光形态发生反应。红色 LED (660 nm) 在 10–100 nmol m-2 s-1 的极低辐照度下对芽伸长产生最强抑制，而远红色 LED (735 nm) 在更高辐照度下产生最强抑制。这种抑制模式在所有品种中都是相似的，尽管抑制程度各不相同。豆芽和块茎皮的颜色在远红光LED下仍然保持黄化，与 380 和 660 nm 之间的 LED 形成对比，后者以辐照度相关的方式产生绿色强度。红光和远红光的混合以及包括红光/远红光反转的脉冲不会产生更强的抑制作用，除非在某些情况下总注量增加。此外，不同LED颜色下的绿芽似乎不会影响种植后随后的出苗和生长。目前的结果表明，多种光敏色素参与了种薯块茎的去黄化和发芽生长抑制，可选择性地用于基于 LED 的红色和远红色波长的绿色发芽。除非在某些情况下总通量增加。此外，不同LED颜色下的绿芽似乎不会影响种植后随后的出苗和生长。目前的结果表明，多种光敏色素参与了种薯块茎的去黄化和发芽生长抑制，可选择性地用于基于 LED 的红色和远红色波长的绿色发芽。除非在某些情况下总通量增加。此外，不同LED颜色下的绿芽似乎不会影响种植后随后的出苗和生长。目前的结果表明，多种光敏色素参与了种薯块茎的去黄化和发芽生长抑制，可选择性地用于基于 LED 的红色和远红色波长的绿色发芽。