• A K M Ghouse

      Articles written in Proceedings – Plant Sciences

    • Longevity of secondary phloem inDelonix regia Rafin

      A K M Ghouse Shamima Hashmi

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      Fortnightly collections of bark samples of 3 consecutive calendar years revealed that the main bulk of secondary phloem formation inDelonix regia takes place late in a calendar year during October and November. About 30 to 40 layers of phloem cells measuring about 400 to 500 μm in depth, are produced during this period. A narrow strip of 4 to 5 layers of new phloem cells (precursor type) also differentiates in late April from the over wintered phloem mother cells. The October-November phloem functions for about 10 to 11 months and the precursor type for about 8 months.

    • Developmental changes in the vascular cambium ofDelonix regia Rafin

      A K M Ghouse Shamima Hashmi

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      The developmental changes occurring in the vascular cambium ofDelonix regia have been studied in different age group trees having different circumferential central axis. It has been found that the cambial cells undergo considerable variation both in their number and dimension with the growing age. The fusiform initials experience a linear expansion by local apical growth, while the ray initials undergo rapid multiplication. The former loses ability of apical expansion and the latter continues to multiply and occupy more area of the cambial cylinder with increasing age.

    • Impact of extension growth and flowering on the cambial activity ofDelonix regia Rafin.

      A K M Ghouse Shamima Hashmi

      More Details Abstract Fulltext PDF

      Shoot growth inDelonix regia takes place in three distinct flushes, the first commencing in mid-March, the second in late May and the third in October. The cambial reactivation starts in April after the initiation of the first flush of shoot growth, but the addition of new vascular derivatives does not take place until the second flush of shoot growth has occurred. Heavy flowering which ensues following first flush of shoot growth seems to delay cell divisions in cambial initials in April. Once the formation of cambial derivatives starts, it continues till mid-November whence the cambium enters the dormant phase. Xylogenesis begins from July and the formation of phloem in October, while the precursor phloem differentiates in early April.

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