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Figure 1. Effects of GA4at bud burst (root growth of 6-year-old Douglas-fir cuttings. Root growth is ex-pressed as the number of actively growing roots at at  and GA7, with or without stem girdling, onTi over its numberT0)
Table 1. Characteristics of pollen size and pollen yield for some conifer and broad-leaved species (adapted from Stanley and Linskens 1974).
Table 2. Effects of environmental conditions on maturation and shedding of Alnus glutinosa(average 17.4 (temperature variation (T) = 13.9 and 24.8  pollen (from Mellerowicz 1983): G = Greenhouse°C (average 16.8 °C), relative humidity variation (RH) = 35 to 70%), L = Laboratory (T = 14.4 to 19.2 °C°C), RH = 41 to 53% (average 46.5%)), FCR+ = positive response to fluorochromatic viability test.
Figure 3. Effects of germination medium and germination test on thegermination of hydrated (A) and nonhydrated (B) Scots pine pollen.(C) Effects of germination medium on pollen tube morphology (BK10= Brewbaker and Kwack solution diluted at 10%, BK10 + P10 = BK10+ 10% polyethylene glycol, BK10 + S10 = BK10 + 10% sucrose) (C.Bastien, INRA, unpublished results).
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