Ethylene responses in three Hydrangea lines

TY - JOUR

T1 - Ethylene responses in three Hydrangea lines

AU - Lauridsen, Uffe Bjerre

AU - Müller, Renate

AU - Lütken, Henrik Vlk

N1 - Conference code: 10

PY - 2015/1/10

Y1 - 2015/1/10

N2 - The ornamental scrub Hydrangea is generally not considered to be particularly sensitive to the phytohormone ethylene. The present study aimed at testing ethylene sensitivity in three different Hydrangea lines: 1, 2 and 3 taking into account the effect of temperature. Ethylene response was measured as leaf epinasty and leaf drop. Data indicated that higher temperature accelerates the effect of 2 μl L-1 ethylene over a 12-day period, and if the inhibitor 1-methylcyclopopene 1-MCP is able to attenuate this effect. Breeding line 1 and 3 dropped 3.8±0.6 and 5.0±0.4 leaves on average, respectively, during the 12-day experimental period. Non-treated controls of line 1 and 3 dropped 1.8±0.6 and 1.8±0.4 leaves, respectively. In contrast, line 2 did not show a significant response to ethylene treatment with a leaf drop of 2.1±0.3 leaves, compared to a leaf drop of 0.8±0.3 in non-treated controls. Furthermore, the type of response between the lines varied. Line 2 was prone to have higher epinasty/leaf drop ratio, compared to line 1. Interestingly, the data indicated that ethylene had a flower inducing effect on 180-day sold plants with an acceleration of up to 30 days, compared to controls. 90-day-old plants treated with ethylene did not show decreased time to flower. This suggests that an age and developmental threshold exists for an initiation of flower development utilizing ethylene in Hydrangea. It is likely that the 90-day-old plants were not yet competent for the flower evocation signal, whereas the apical buds of the 180-day-old plants had undergone the required developmental processes making them competent.

AB - The ornamental scrub Hydrangea is generally not considered to be particularly sensitive to the phytohormone ethylene. The present study aimed at testing ethylene sensitivity in three different Hydrangea lines: 1, 2 and 3 taking into account the effect of temperature. Ethylene response was measured as leaf epinasty and leaf drop. Data indicated that higher temperature accelerates the effect of 2 μl L-1 ethylene over a 12-day period, and if the inhibitor 1-methylcyclopopene 1-MCP is able to attenuate this effect. Breeding line 1 and 3 dropped 3.8±0.6 and 5.0±0.4 leaves on average, respectively, during the 12-day experimental period. Non-treated controls of line 1 and 3 dropped 1.8±0.6 and 1.8±0.4 leaves, respectively. In contrast, line 2 did not show a significant response to ethylene treatment with a leaf drop of 2.1±0.3 leaves, compared to a leaf drop of 0.8±0.3 in non-treated controls. Furthermore, the type of response between the lines varied. Line 2 was prone to have higher epinasty/leaf drop ratio, compared to line 1. Interestingly, the data indicated that ethylene had a flower inducing effect on 180-day sold plants with an acceleration of up to 30 days, compared to controls. 90-day-old plants treated with ethylene did not show decreased time to flower. This suggests that an age and developmental threshold exists for an initiation of flower development utilizing ethylene in Hydrangea. It is likely that the 90-day-old plants were not yet competent for the flower evocation signal, whereas the apical buds of the 180-day-old plants had undergone the required developmental processes making them competent.

U2 - 10.17660/ActaHortic.2015.1060.5

DO - 10.17660/ActaHortic.2015.1060.5

M3 - Journal article

SN - 0567-7572

VL - 1060

SP - 39

EP - 46

JO - Acta Horticulturae

JF - Acta Horticulturae

T2 - International Symposium on Postharvest Quality of Ornamental Plants 2015

Y2 - 10 January 2015

ER -