TY - JOUR
AU - Aussenac,, G.
AB - Abstract Two-year-old Corsican pine (Pinus nigra ssp. laricio var. Corsicana) seedlings were either well watered or subjected to a moderate drought for one month before being lifted from the nursery bed on October 9 and transplanted. Well-watered, non-transplanted seedlings served as controls. Needle predawn water potential (Ψwp), non-structural carbohydrate concentrations and plant development (survival, bud break, shoot elongation) were assessed before and during the first growing season after transplanting. On April 16, just before bud break, Ψwp was lower for the well-watered + transplanted and drought-conditioned + transplanted seedlings (Ψwp = –1.45 and –1.83 MPa, respectively) than for the controls (Ψwp = –0.56). There was a close relationship between the Ψwp measured on April 16 and bud break, shoot elongation and plant survival during the following growing period. Above a Ψwp of –1.1 MPa, all plants developed normally. Between –1.1 MPa and –1.6 MPa, bud break, and thus shoot elongation, did not occur in all plants. Between –1.6 MPa and –2.1 MPa, the plants were characterized by the absence of shoot growth, but mortality was zero. Below –2.1 MPa, there was a large increase in plant mortality. On April 16, starch concentrations were markedly lower in the roots of transplanted seedlings than in the controls. There was a positive correlation between Ψwp and root starch concentration. The Ψwp (–2.3 MPa) at which complete starch depletion was observed in the roots corresponded to the Ψwp below which plants did not survive. These results suggest that mechanisms specifically linked to altered water status and metabolic processes associated with altered carbohydrate status are involved in transplanting stress; however, it was not possible to disentangle the two effects. Drought conditioning did not lead to a marked increase in soluble carbohydrate concentrations, as reported for other species, and did not increase plant tolerance to transplanting stress. This content is only available as a PDF. © 1993 Heron Publishing—Victoria Canada
TI - Planting stress, water status and non-structural carbohydrate concentrations in Corsican pine seedlings
JO - Tree Physiology
DO - 10.1093/treephys/12.2.173
DA - 1993-03-01
UR - https://www.deepdyve.com/lp/oxford-university-press/planting-stress-water-status-and-non-structural-carbohydrate-G0tWuV40ST
SP - 173
EP - 183
VL - 12
IS - 2
DP - DeepDyve
ER -