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THE EFFECT OF LOW TEMPERATURE ON DRY MATTER PRODUCTION, CHLOROPHYLL CONCENTRATION AND PHOTOSYNTHESIS OF MAIZE PLANTS OF DIFFERENT AGES *
Author(s) -
Alberda Th.
Publication year - 1969
Publication title -
acta botanica neerlandica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0044-5983
DOI - 10.1111/j.1438-8677.1969.tb00568.x
Subject(s) - photosynthesis , chlorophyll , chlorophyll a , dry matter , growth rate , botany , horticulture , biology , agronomy , chemistry , mathematics , geometry
SUMMARY Young seedlings of Zea mays L. scarcely grow at temperatures of 15 °C or lower. The leaves are yellowish, the chlorophyll concentration being lower than 10 μ g (a+b) per cm 2 , and the rate of photosynthesis is negligible. When a period of low temperature is given to older plants, which already have some green leaf surface, the reduction in relative growth rate and photosynthesis is less severe. Only those leaf parts that elongate during the cold treatment are yellow. It can be shown that the day temperature is the important factor in influencing the chlorophyll concentration in growing leaf parts. Plants subjected to low night temperatures remain fully green and their growth rate is virtually unaffected. The data suggest that photosynthesis rate is reduced at concentrations of chlorophyll (a+b) below 40 μ g per cm ‐2 . When plants are brought back to temperatures of 20 ° or higher both photosynthesis rate and growth rate soon reach values normal for this temperature.