บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

The effect of calcium treatments on aspects of cell wall metabolism in apple cv ‘Braeburn’

Mignani I., Braeburn

5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004. page 13

2004

บทคัดย่อ

The effect of calcium treatments on aspects of cell wall metabolism in apple cv ‘Braeburn’    ‘Braeburn’ apple is appreciated because its ‘çrispy’ texture and acid taste but it is very susceptible to several storage disorders-mealiness included-, because it low calcium content.Many attempts are in progress to improve cation flesh concentration and thus its keeping quality.Aim of the present work is to study the capability offield and postharvest treatments in keeping fruit quality during cold storage.

‘Breaburn’ apples field or postharvest treated with diverse Calcium formulae and additives, were examined for quality (total soluble solids; titratable acidity; flesh firmness; starch content), calcium contents and cell wall biochemical (cellulose; total, soluble and insoluble pectin; neutral sugars) traits at harvest and after 7 months of controlled atmosphere cold storage (ULO).Field and postharvest calcium treatments did not affect quality traits both at harvest and after storage, nevertheless they influenced calcium contents in fruit flesh and they modified cell wall.

All field treatments increased fruit calcium content up to 10-60% according the type and timing and the effect lasted till the end of storage; postharvest treatments increase cation level (8-60%) at the end of storage.Cellulose contents increased for both treatments and the effect lasted during storage.Field supplies seemed to stimulate pectin biosynthesis also after harvest for long time, while postharvest treatments did not increase pectin biosynthesis but were veryeffective in preventing pectin solubilization.Cell wall rhamnose was reduced by field treatments, thus reducing the side chain number of polygalacturonic acid to which ascribe the flesh crispness of this apple cultivar. Galactose, a basic component of pectin chains, is positively affected by field supplies and its high level is maintained along the storage period.Postharvest calcium treatments did not increase galactose content, but were very active in saving its levels.This results confirmed the influence of calcium o­n cell wall metabolism.