The mitotic activity of meristems of vegetative bud cells of English oak (Quercus robur L.)
Journal Title: Лісівництво і агролісомеліорація - Year 2012, Vol 120, Issue
Abstract
The improved methodology of studing of apical meristems of vegetative buds of English oak (Quercus robur L.) with application of the squash preparations stained by hematoxylin is given. Advantages of this technique are that the preparations made this way may be kept for researching during 2 years. Day rhythmic of activity of cells, indшсуі of phases of mitosis, coefficients of phases were studied for apical meristems of vegetative buds of English oak. Researches of proliferouse activity dynamics of cells of apical meristems educed two maximums of mitotic index (MI) during the day – at 7 AM (32.3‰) and at 10 AM (33.3‰). Analysis of indices of phase values showed that maximum of mitotic activity of cells at 7 AM was formed due to increase of amount of cells in all phases of division. The peak of MI at 10 AM was formed due to increase of amount of cells in early phases of mitosis. The minimum value of mitotic index is educed at 18 o'clock – 8.00‰. An average daily value of MI is 22.1 ‰. Comparison of values of coefficients of phases allows doing supposition that the simultaneous delay of passing by cells’ prophases and metaphases leads to forming of daily rhythms of mitotic activity. Further expansion of such researches can allow suggesting the indexes of mitotic activity of cells as marker signs for prediction of rate of tree growth in the young age.
Authors and Affiliations
L. Torosova
Keywords
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