Light emitting diodes in greenhouse chrysanthemum: Effect on morphoanatomy and physiological responses
Ganesh S, Jawaharlal M, Rajamani K, Thamaraiselvi SP
Light Emitting Diodes in greenhouse industry have increased the light use efficiency under cut flower production. In the present study, the morphoanatomy and physiological responses of LEDs was tested in two cut flower varieties of chrysanthemum under controlled conditions at Coimbatore. The investigation revealed that the spectral combination of 80% Red + 20% Blue (L3) registered improved morphoanatomic characters such as total leaf area at growth stages (1327.48 cm2 and 1155.55 cm2); total stem yield/sq.m (41.99) and marketable high grade flowers (Grade A - 40.07 stems/sq.m and 40.70 stems/sq.m) respectively and physiological parameters such PPFD (573 µmolm-2s-1 at above the canopy and 241.67 µmolm-2s-1 at inter canopy level in Salvador and 578.67 µmolm-2s-1 at above the canopy and 294 µmolm-2s-1 at inter canopy level in Pusa Centenary); light interception level at both varieties (17.115% at canopy surfaces) and high light transmission ration of 57.245as followed by the spectral composition of 75% Blue+25% Far-red (L5). The quality of light have influenced the high light incident at above canopy and intercanopy level, net photo synthetic rate and thereby increase the plant dry mass accumulation by altering leaf total leaf area, stomatal conductance and improve photosynthetic carbon assimilation under RD radiated zones.