ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

The relationship between changes in lignification and the mechanical strength of rose flower peduncles.

Chabbert, B.; Monties, B.; Zieslin, N.; Ben-Zaken, R.;

Acta Botanica Neerlandica Year: 1993 Vol: 42 Issue: 2 Pages: 205-211 Ref: 32 ref.

1993

บทคัดย่อ

The physiological disorder bent-neck (the bending of stems of cut rose flowers during aging) is an important factor in determining postharvest quality. The content and composition of lignin was determined in the respectively strong and weak peduncles of cultivars Mercedes and Nubia. Xylem tissues of the peduncles of Mercedes were more lignified than those of Nubia. However, phloem lignin content was increased only in the basal parts of the peduncles of Mercedes. Differences in the monomeric composition of lignins were apparent between the cultivars. In both the phloem and xylem fractions, lignin in the peduncles of Mercedes was less condensed than that in Nubia. Furthermore, lignin rich in syringyl monomeric units occurred in the distal parts of the strong peduncles, accounting for their higher guaiacyl:syringyl (S:G) ratio. It appeared that, although lignin from both phloem and xylem tissue showed a similar S:G ratio, the phloem fraction must synthesize a more condensed lignin network than xylem tissue. Such qualitative and quantitative lignin differences suggest the possible role of lignification in the resistance of rose peduncles to bending.