Studies On Developmental Physiological Mechanism Of Lily And The Effect Of SA On Lily Bulb Swelling Development

Experiment with 4-6cm-circumference bulblet of Asiatic hybrids 'Prato' and Longiflorum and Asiatic hybrids 'Evening Star', the developmental mechanism and the law of nutrient uptake and distribution of bulblet under the natural cold and cool Harbin area was studied. The effect on bulb growth and development of exerting salicylic acid treatment was also studied. It made clear the principles and characteristics of the bulblet growth and development of lily in cool-climate Harbin area, discovering the effect on bulblet swelling development of lily by exerting SA, which has important theoretic and practical meaning in the progress of the commercial bulb production taken in our country. The main results are summarized as bellow:1. The cool Harbin area is suit for bulb production of lily, where the natureal rejuvenation effect on the bulblet of lily is remarkable. Through one growing season, the average circumference and fresh weight of the harvested bulbs of 'Evening Star' was 12.7cm and 27.5g respectively, which was 2.5 times and 10 times of that of bulblets respectively. The the average circumference and fresh weight of the harvested bulbs of 'Prato' was 10.9cm and 15.1g, 2.2 times and 6 times of that of bulblets respectively.2. The main characteristics for bulb development of lily in Harbin area can be summarized as: Weightlessness and nutrient consumption period, compensation period, the rapid enriching and weighting period, growth suppressed period, fast swelling and enriching period. The rapid swelling and weighting periods of lily bulb in Harbin area was in June and September.3. The content of total sugar, soluble sugar, reducing sugar and protein were quickly decreasing before seeding period, and the starch content was also a bit reducing, which revealed that the storage nutrition in bulb was the source of energy for lily's early growth. After this, the content of starch, total sugar and that of protein were increasing and rearched the peak during half-withered period. The maximum content of starch or that of protein means the bulb maturation. By and large, the souluble sugar content and reducing sugar content of lily bulb kept stable.4. The content of carbohydrate and protein in stem-leave parts and roots of lily was always lower than that of bulb and daughter bulb. From seeding stage to half-withered period, the starch content and soluble sugar content in stem-leave parts were continuously increasing, on the contrary, the protein content in stern-leave parts was always decreasing. The reducing sugar content in roots slightly increased, while the content of starch and soluble sugar varied in a narrow range. 5. Of N, P₂O₅ and K₂O, K₂O and N had the more absorption, P₂O₅ absorbed less. Lily needed more nutrition during the visible bud stage and the half-withering stage, which was also the critical fertilization period in lily bulb productive progress. The suitable proportion of N, P, K is 1:0.2～0.3:1.0～2.0.6. Foliar spraying during growing season with or dipping the bulblet into appropriate salicylic acid before planting was benefit for swelling and weighting of the harvested bulb, but the influence on the circumstance of harvested lily bulb was week and not significant. The circumference and weight of harvested 'Prato' bulb treated by SA foliar spraying was less than CK.7. SA treatment affected the content of bulb storage. The content of souble protein remarkably increased in the harvested dipping-into-SA pretreatment bulbs, and the starch content of harvested bulb was also increased. The content of starch of spraying-SA-treated bulb increased, but that of the soluble protein was dramatically reduced: Change of soluble sugar content of SA-treated was different accordingly.