Turkey oak is among the species that can be used for the afforestations in the semi-arid and arid regions of Turkey. Understanding how the Turkey oak responds to drought could contribute to improve ...stress tolerance and to the success of afforestation programs of species. In this study, the response of one-year-old seedlings of Turkey oak (Quercus cerris L.) to the drought stress was investigated. Under controlled conditions, the seedlings in the control group were regularly irrigated during the stress experiment, while drought-stressed seedlings were subjected to drought stress by withholding irrigation for 30 days. Both control and drought-stress treatment groups were sampled on days 0, 7, 14, 21 and 30, and their stem xylem water potential, stomatal conductance and total soluble sugars were determined. In addition, the volumetric soil moisture content was also determined. As a result, significant differences were found in xylem water potential, stomatal conductance and total soluble sugar between the control and drought-stressed seedlings. Drought stress significantly reduced soil moisture content and consequently, xylem water potential of the drought-stressed oak seedlings were lower than the control seedlings. Drought stress decreased stomatal conductance, but significantly increased accumulations of total soluble sugars.
İncir ağaçlarında odun dokusunda zararlı olan Bostrychidae, Buprestidae, Cerambycidae, Curculionidae ve Scolytidae (Coleoptera) familyalarına ait türler 2000-2001 yılları arasında Aydın ilinde ...saptanmıştır. Sonuçta toplam 16 tür elde edilmiş ve bunlardan 8 tanesi Türkiye' de incir zararlısı olarak ilk kayıttır. Bu türler Anthaxia cichorii Olivier, Agrilus roscidus Kiesenwetter, Acmaeodera (s.str.) flavolineata Laporte and Gory (Buprestidae), Stenopterus flavicornis Küster (Cerambycidae), Xyloperthella picea Olivier, Xylonites praeustus Germar, Scobida chevrieri Villa (Bostrychidae) ve Hypothenemus eruditus Westwood (Scolytidae)'tur. X. picea aynı zamanda Türkiye faunası için yeni kayıttır. Elde edilen türlerden Hypoborus ficus Erichson (Scolytidae), Hesperophanes griseus Fabricius (Cerambycidae), Scobida chevrieri Villa ve Sinoxylon sexdentatus Oliver (Bostrychidae) incir ağaçlarında en yaygın ve bol bulunan türler olarak saptanmıştır.
Xylophagous insects, Bostrychidae, Buprestidae, Cerambycidae, Curculionidae and Scolytidae (Coleoptera), on fig trees in Aydın province, Turkey, were investigated in 2000 and 2001. Sixteen species of Coleoptera were collected, of which 8 are new records as fig pests in Turkey: Anthaxia cichorii Olivier, Agrilus roscidus Kiesenwetter, Acmaeodera (s.str.) flavolineata Laporte and Gory (Buprestidae), Stenopterus flavicornis Küster (Cerambycidae), Xyloperthella picea Olivier, Xylonitespraeustus Germar, Scobida chevrieri Villa (Bostrychidae) and Hypothenemus eruditus Westwood (Scolytidae). In addition, X. picea is the first record for the Turkish fauna. However, it was observed that Hypoborus ficus Erichson (Scolytidae), Hesperophanes griseus Fabricius (Cerambycidae), Scobida chevrieri Villa and Sinoxylon sexdentatus Oliver (Bostrychidae) were common species and caused losses by damaging both stems and branches.
Kratko vrijeme prije sazrijevanja boba vinove loze rastrgne se u njihovim žilama na više mjesta čitav ksilem. Pri tom nastaju transverzalni prekidi ksilema koji zahvaćaju sve sudove provodne žile. ...Prekidi se prilično ravnomjerno ponavljaju u određenim udaljenostima. Očito je da su prekidi posljedica nesposobnosti ksilema da rastezanjem prati porast volumena ploda.
Gljivica Cercospora beticola stvara na listovima šećerne repe mnogobrojne pjege koje znatno smanjuju prirod. Da bi se ustanovilo da li se u mjesecu listopadu alteriraju prividno zdrava područja ...listova između pjega, istražena su elektronskim mikroskopom ta područja. Ta su mjesta na listovima bila 2 do 3 mm udaljena od ruba pjega koji je bio crvenosmeđe obojen.
Istraživanja su pokazala da se u tim područjima nalaze samo u ksilemu mnogobrojne bakterije i poneke hife vjerojatno od vrste C. beticola. U zdravim područjima listova, koji su bili još više udaljeni od pjega, nismo mogli pronaći ni gljivinih hifa ni bakterija. Na osnovi tih zapažanja može se zaključiti da je sigurno da bakterije ulaze u prividno zdrava tkiva lista kroz pjegu, ali se ipak ne mogu u znatnijoj mjeri udaljiti od područja pjege.
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