Nucleolar Activity in Differentiating Cotton Fibres is Related to the Position of the Boll on the Plant

Peeters, M.‐C.; Dillemans, W; Voets, S.

doi:10.1093/jxb/42.3.353

Cited by 1 publication

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“…Emasculated fruit remained untouched until sampled at a later date and only F1 blooms on fruiting branches numbering 10 and higher were used to reduce possible position eects on nucleolar enlargement (Peeters et al 1991).…”

Section: Methodsmentioning

confidence: 99%

Production of micronucleoli and onset of cotton fiber growth

Hof

1998

Planta

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Experiments focused on the early development of ®ber cells of cotton (Gossypium hirsutum L. cv. MD51 ne) ovules produced two novel ®ndings: one biological, the other methodological. The ®rst concerns a micronucleolus in the nucleus of ®bers. This developmental marker appears at or a little before 4 days postanthesis (dpa) in about 10% of the ®bers and increases thereafter to nearly 80% provided the ®bers are growing on fertilized ovules. Micronucleoli are neither seen in nuclei of ®bers at 0±2 dpa nor in nuclei of non-®ber cells. Consequently, it is postulated that they are the product of speci®c developmental genes associated with ®ber growth. The second, methodological ®nding, involves a cytological means of directly counting the number of ®bers produced on young ovules at 1±4 dpa. The method provides quantitative data unavailable in the past. We used this method to show that emasculation caused a temporary 24-h delay in the initiation of ®bers, that 30% of the ®bers are aected, and that at 3 dpa both fertilized and unfertilized ovules have about 14 500 ®bers. These data indicate that the ®bers on fertilized and unfertilized ovules represent the same cell populations, a ®nding heretofore unknown.

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Section: Methodsmentioning

confidence: 99%