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Seed Germination in Lettuce Affected by Light Quality and Plant Growth Regulators  

Hwang, Hyeon-Jeong (Institute of Life Science & Resources, Kyung Hee University)
Lee, Jung-Myung (Institute of Life Science & Resources, Kyung Hee University)
Kim, Se-Young (Institute of Life Science & Resources, Kyung Hee University)
Choi, Geun-Won (Institute of Life Science & Resources, Kyung Hee University)
Publication Information
Journal of Bio-Environment Control / v.17, no.1, 2008 , pp. 51-59 More about this Journal
Abstract
Lettuce, a typical light-induced seed germination type, exhibits different germination responses according to cultivars, light quality, and plant growth regulator (PGR) treatments. Germination rates in most tested cultivars were over 85% under both white and red light, and were slightly decreased by blue light. Although photo-inhibition in germination was observed from most cultivars by far-red light, 'Cheongguangcheongchima', 'Okdol', and 'Manchudaecheongchima' could be classified as photo-insensitive lettuce cultivars by exhibiting the germination rates as 78,63, and 48% under for-red light, respectively. 6-Benzylamino purine (BAP) and kinetin promoted seed germination and normal seedling production under far-red light, but ethephon did not show any positive effects. Cytokinins such as BAP, kinetin, thidiazuron (TDZ), and zeatin overcame photo-inhibition of seed germination even the concentration of below $50\;mg{\cdot}L^{-1}$. However, auxins such as IBA, 2,4-D, and NAA failed to overcome the far-red light-induced photo-inhibition.
Keywords
cultivars; germination; light quality; PGR;
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