Autori: Monica David

Editorial: Romanian Agricultural Research, 27, p.27-34, 2010.

Rezumat:

Excised leaf water loss has been suggested as a technique to identify cereal genotypes that loose less water
through cuticle and incompletely closed stomata, mainly during the night, and are therefore more adapted to dry
environments. Initial water content (IWC) and water loss after 4 hours (WL1) and during the period from 4 to
24 hours (WL2) following excision was measured in a collection of forty four cultivars of common wheat(Triticum aestivum L.) and durum wheat (T. durum L.), including cultivars from different regions and with contrasting performance under drought. Environmental conditions of the two years of study had a large
influence on IWC, WL1 and WL2. Differences between cultivars were significant for all parameters, but
interaction between cultivars and years was strong for water loss, suggesting that readings from one year might
not be meaningful for other environmental conditions. Genotype*Environment interaction for IWC was less important. Common wheat cultivars adapted to dryer conditions generally had lower IWC, while durum wheat cultivars had highest IWC. Water loss during the first 4 hours after excision was negatively correlated, or was not correlated with water loss during the next 20 hours. Water loss through cuticles, as expressed by water loss from excised leaves, did not represent a major mechanism determining known genotypic differences in drought
resistance in the field. Further improvements of the techniques for measuring water loss from excised leaves are needed to reduce the interaction with environmental conditions, in order to make this approach more useful for breeding drought resistant wheat.

Cuvinte cheie: wheat, water loss, excised leaves

URL: http://www.incda-fundulea.ro/rar/nr27/rar27.4.pdf