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The physiological response to cutting in Italian ryegrass
Author(s) -
CLARK BRENDA J.,
PRIOUL J.L.,
COUDERC H.
Publication year - 1977
Publication title -
grass and forage science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.716
H-Index - 56
eISSN - 1365-2494
pISSN - 0142-5242
DOI - 10.1111/j.1365-2494.1977.tb01405.x
Subject(s) - transpiration , lolium multiflorum , photosynthesis , carbon dioxide , saturation (graph theory) , leaf blade , vitis vinifera , nitrogen , horticulture , botany , chemistry , biology , mathematics , organic chemistry , combinatorics
The kinetics of decline in net photosynthesis and transpiration after cutting was followed in a batch of Lolium multiflorum leaves at light saturation in an assimilation chamber where air temperature, leaf temperature, carbon dioxide concentration and water vapour concentration were controlled. After leaf excision the rates of photosynthesis and transpiration increased or remained the same for 1–2 min and then decreased sharply following a curve with two breaks of slope at 15 min and 30 min. To investigate stomatal behaviour, fragments of leaf tissue were removed, fixed by freezing in liquid nitrogen, then examined by scanning electron microscopy. The stomata were optically closed by 15 min after excision. The practical implications for field drying of Italian ryegrass are discussed.