TY - JOUR
T1 - Role of water relations and photosynthesis in the release of buds from apical dominance and the early reinvigoration of decapitated poplars
AU - Blake, Terence John
AU - Tschaplinski, Timothy James
PY - 1986/10
Y1 - 1986/10
N2 - A decrease in xylem pressure potential starting 1 h after decapitation of young hybrid poplars (Populus deltoides Bartr. ×Populus nigra L. cv. DN22) reduced stomatal conductance and transpiration rates for the first 3 days after decapitation. This early moisture stress was alleviated 4 to 5 days after decapitation, resulting in substantial increases in stomatal aperture, transpiration and net photosynthetic rates which continued for the remainder of the one week measurement period. The results suggest the following sequence of events in the decapitated plant: After a brief moisture stress, decapitation increases moisture availability by increasing the root/shoot ratio and by reducing shoot competition for moisture. Improvement in hydration releases buds from apical dominance and increases stomatal conductance and rates of net photosynthesis. This, in turn, leads to the acceleration of growth observed when plants are reinvigorated by decapitation.
AB - A decrease in xylem pressure potential starting 1 h after decapitation of young hybrid poplars (Populus deltoides Bartr. ×Populus nigra L. cv. DN22) reduced stomatal conductance and transpiration rates for the first 3 days after decapitation. This early moisture stress was alleviated 4 to 5 days after decapitation, resulting in substantial increases in stomatal aperture, transpiration and net photosynthetic rates which continued for the remainder of the one week measurement period. The results suggest the following sequence of events in the decapitated plant: After a brief moisture stress, decapitation increases moisture availability by increasing the root/shoot ratio and by reducing shoot competition for moisture. Improvement in hydration releases buds from apical dominance and increases stomatal conductance and rates of net photosynthesis. This, in turn, leads to the acceleration of growth observed when plants are reinvigorated by decapitation.
KW - Populus deltoides
KW - rejuvenation
KW - stomatal conductance
KW - transpiration
KW - water potential
UR - http://www.scopus.com/inward/record.url?scp=84989743539&partnerID=8YFLogxK
U2 - 10.1111/j.1399-3054.1986.tb01928.x
DO - 10.1111/j.1399-3054.1986.tb01928.x
M3 - Article
AN - SCOPUS:84989743539
SN - 0031-9317
VL - 68
SP - 287
EP - 293
JO - Physiologia Plantarum
JF - Physiologia Plantarum
IS - 2
ER -