The Physiology Of The Main Branches Of The Hawthorn And The Postharvest Physiology

1. To explore the effects of trunk-bending on branch characteristics and fruit setting performance of ‘Mengshanhong' hawthorn,we did three treatments on its trunk that were0°,70°,nearly 90°bending angle at the next spring after planting.The results showed the hawthorn which trunk under 90°bending angle was superior to other treatments at the amount of branch and fruiting branch,inflorescence and fruiting inflorescence,flower and fruiting flower;the percentage of middle and short branch,the percentage of middle and long fruiting branch of the hawthorn which trunk under 70°bending angle were higher than others.2. The aim was to study the effect of 1-MCP, calcium chloride and chitosan on postharvest quality and physiological changes of hawthorn fruit, and the effect of Malus doumeri leaf on hawthorn rot, and to provide a theoretical basis and practical guidance for the storage of hawthorn. Firmness, rot index and sound fruit rate, weight loss, respiratory intensity, the contents of total soluble solids(TSS), titratable acidity(TA),malondialdehyde(MDA) and the activity of peroxidase(POD) of‘mengshanhong',‘mianzha' hawthorn fruit treated with different concentrations of 1-MCP,calcium chloride and then stored under room temperature were investigated regularly. All the indicators above of ‘mengshanhong',‘mianzha' ‘fuquanhong' hawthorn fruit treated with different concentrations of chitosan and then stored under room temperature were investigated regularly. The rot index and sound fruit rate treated with different concentrations of Malus doumeri leaves extract and then stored under 18±3? were investigated regularly.Results:(1) 1-MCP, calcium chloride and chitosan could delay the decrease of firmness and content changes of TSS and TA;decreased the rot index and maintained a high rate of intact fruit during the hawthorn storage; alleviated the loss of weight; reduced the fruit respiratoryintensity and the respiratory peak; reduced accumulation of MDA and improved activity of POD.(2) 2% chitosan delayed the arrival of respiratory climacteric peak of ‘Mengshanhong'hawthorn but accelerated the decrease of TA content during the later stage of storage.(3) Calcium chloride with high concentration could enhance respiration and increase the fruit rot.(4) In a comprehensive view, the optimum concentration was 1?L/L for ‘mengshanhong'hawthorn,1?L/L or 2?L/L for ‘mianzha' hawthorn when treated with 1-MCP; the optimum concentration was 3% for both ‘mengshanhong' hawthorn and ‘mianzha' hawthorn when treated with calcium chloride; the optimum concentration was 0.5% for ‘mengshanhong'hawthorn, 1% for ‘mianzha' hawthorn and ‘fuquanhong' hawthorn when treated with chitosan.(5) Malus doumeri leaves extract could reduce hawthorn rot during the storage. With a standard of more than 90% of sound fruit rate, the storage life of ‘mianzha' hawthorn fruit treated with Malus doumeri leaves extract was 30 days more than CK's.