{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,19]],"date-time":"2025-10-19T09:30:06Z","timestamp":1760866206476},"reference-count":52,"publisher":"EDP Sciences","issue":"1","license":[{"start":{"date-parts":[[2019,8,12]],"date-time":"2019-08-12T00:00:00Z","timestamp":1565568000000},"content-version":"vor","delay-in-days":223,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Ci\u00eancia T\u00e9c. Vitiv."],"accepted":{"date-parts":[[2019,7,19]]},"published-print":{"date-parts":[[2019]]},"abstract":"<jats:p>The degree of tolerance to heat stress (HS) differs among grapevine varieties. HS affects the duration and the regularity of the cell cycle in plants. The cytogenetic studies in grapevine are scarce, and the consequences of HS in the mitosis are barely known. This work intends to evaluate the consequences of induced HS in the mitotic cell cycle and chromosomes of four wine-producing varieties: Touriga Franca (TF), Touriga Nacional (TN), Rabigato and Viosinho using a cytogenetic approach. HS (1h at 42 \u00baC) was induced in plants of the four grapevine varieties that grew in vitro for 11 months. Plants of the same varieties and with equal age were used as control (maintained in vitro at 25 \u00baC). Three plants per variety and treatment (control and HS) were analysed. After HS, root-tips were collected in all plants and immediately fixed to be used for the preparation of mitotic chromosome spreads. In total, 6,116 root-tip cells were scored. Among the 5,973 dividing cells, 24.33% showed different types of irregularities in all mitotic phases (prophase, metaphase, anaphase, and telophase). After HS, the mitotic index (MI) decreased in the varieties TF and Viosinho, and increased in TN and Rabigato, relatively to the control. However, the average values of MI did not show statistically significant differences (p \u02c3 0.05) among varieties, treatments and for the variety x treatment interaction. The percentage of dividing cells with anomalies (%DCA) increased after HS in all varieties relatively to the control. The average values of %DCA presented statistically significant differences (p &lt; 0.05) only between treatments. As far as we know, this work constitutes the first cytogenetic evaluation of the HS effects in the mitotic cell cycle and chromosomes of grapevine using meristematic cells of root-tips. TN has been considered tolerant to various abiotic stresses (drought and excessive heat and light) based on other methodologies. TF and Viosinho have been referred as tolerant to abiotic stress without deeper studies available, and till the development of our investigation, the sensibility of Rabigato was unknown. Among the varieties analysed in this work, Rabigato revealed to be the less tolerant to HS. This research can be useful for selection of grapevine clones more tolerant to HS for commercialization and for the improvement of the economic sustainability.<\/jats:p>","DOI":"10.1051\/ctv\/20193401061","type":"journal-article","created":{"date-parts":[[2019,8,12]],"date-time":"2019-08-12T07:52:00Z","timestamp":1565596320000},"page":"61-70","source":"Crossref","is-referenced-by-count":4,"title":["Heat stress tolerance assayed in four wine-producing grapevine varieties using a cytogenetic approach"],"prefix":"10.1051","volume":"34","author":[{"given":"Ana","family":"Carvalho","sequence":"first","affiliation":[]},{"given":"Fernanda","family":"Leal","sequence":"additional","affiliation":[]},{"given":"Manuela","family":"Matos","sequence":"additional","affiliation":[]},{"given":"Jos\u00e9","family":"Lima-Brito","sequence":"additional","affiliation":[]}],"member":"250","published-online":{"date-parts":[[2019,8,12]]},"reference":[{"key":"R1","unstructured":"Alves F., Edlmann M., Costa J., Costa P., Macedo P., da Costa P.L., Symington C., 2013. 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