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COTTON SEEDLING MORPHOGENIC RESPONSES TO FR/R RATIO REFLECTED FROM DIFFERENT COLORED SOILS AND SOIL COVERS
Author(s) -
Kasperbauer Michael J.,
Hunt Patrick G.
Publication year - 1992
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1992.tb02205.x
Subject(s) - seedling , shoot , biomass (ecology) , soil water , colored , botany , phytochrome , horticulture , biology , far red , gossypium hirsutum , agronomy , red light , ecology , materials science , composite material
— Cotton ( Gossypium hirsutum L.) seedlings were morphologically responsive to red (R) and far‐red (FR) light (low and high FR/R photon ratios, respectively) from time of emergence. Controlled environment R and FR treatments confirmed phytochrome involvement in biomass allocation among new leaf, stem and root growth. Seedlings that received the high FR/R photon ratio developed longer and heavier stems, leaves with lower specific weights, less massive roots and higher shoot/root biomass ratios. Other cotton seedlings were grown in sunlight over different colored soils or painted panels to measure morphological effects of FR/R photon ratio in upwardly reflected light. Morphological responses to a given FR/R ratio were the same whether the reflection was from natural soil or from a painted surface. Seedlings that received the higher FR/R photon ratios in upwardly reflected light developed longer stems, leaves with lower specific weights, less massive roots and higher shoot/root biomass ratios. The potential use of colored mulches in agriculture was discussed.