Shuck dehiscence in pecan (Carya illinoensis (Wang) K. Koch) was associated with the dissapperance of growth promotor(s) with RPs similar to that of indoleacetic acid (IAA) and an increase in the level of an abscisic acid-like inhibitor, and the appearance of a second inhibitor at the Rf of IAA.
Rapid and timely production of kiwi (Actinidiadeliciosa) seedlings is often hampered by poor and erratic seed germination. This investigation was conducted to assess the effect of gibberellic acid, cold stratification (5° C), and their combinations on seed germination and subsequent radicle elongation. Germination counts and radicle elongation measurements were made two weeks after incubation at 25.4° C under continuous light and approximately 100% RH. GA treatments broke dormancy and increased germination and radicle elongation with increasing concentration up to 2500 ppm. At 5000 ppm, germination and radicle elongation were reduced. Cold stratification (1 and 2 week durations) alone did not affect germination nor break dormancy. Combined cold stratification and GA treatments significantly enhanced seed germination and radicle elongation with the best response at the highest GA concentration (5000 ppm) and longest stratification (2 weeks), regardless of whether the seeds were stratified prior to or after GA treatments.
Nationally, the urban and community forests are in a state of rapid decline. About 52% of street trees are dead or dying. The average tree life of the urban areas is about five times less than in rural areas. The growing national awareness of the importance and benefits of trees and their role in maintaining a healthy environment magnifies the need for urban forestry training programs. The Southern University Urban Forestry Program (funded by USDA Forest Service, Southern Region) is set up to address the critical need for high quality, user-oriented urban forestry training for minority students, and to bridge the gap between minority participation and national forestry resources, education and management programs. This unique program places major emphasis on experiential learning activities in addition to sound academic education. The four-year curriculum will be centered around forestry, horticulture, urban and community planning and landscape architecture.