20.500.12556/RUL-189120 Anatomija in delovanje listnih rež koruze (Zea mays) ob različnem deficitu tlaka vodne pare Anatomy and function of leaf stomata of maize (Zea mays) under different vapor pressure deficits Deficit tlaka vodne pare (VPD) med listom in ozračjem je gonilna sila transpiracije, ki omogoča preskrbo rastlin z vodo in hranili, hkrati pa se z njo voda izgublja iz rastline. S segrevanjem ozračja se VPD povečuje, s tem pa tudi izguba vode. Rastline vodno bilanco regulirajo z odpiranjem in zapiranjem rež. Njihov odziv na okoljske razmere, npr. na talno ali zračno sušo, se med rastlinskimi vrstami razlikuje, med drugim je odvisen tudi od anatomske zgradbe rež. V nalogi smo dinamiko odziva rež na spremembe VPD proučevali pri dveh hibridih koruze, ki sta deklarirana kot različno tolerantna na sušo ('P8834' Aquamax in 'P9363'; Corteva Agriscience™). Polovica rastlin je bila nekaj ur dnevno izpostavljena megljenju (manjši VPD), druga polovica pa je rastla v dejanskih razmerah (večji VPD), v delu poskusa so bile rastline tudi različno zalite. Preučevali smo vpliv aklimatizacije na manjši VPD, hibrida in vlažnosti substrata na anatomijo listnih rež in njihov odziv pri različnih vrednostih VPD, ki pa jih zaradi premalo intenzivnega in nezadostno uravnavanega megljenja nismo uspeli doseči v želenem obsegu. Anatomija listnih rež se je med hibridoma razlikovala že v osnovi, po aklimatizaciji pa je prišlo do novih sprememb med obravnavanji, vendar ne moremo trditi, da je to posledica naših vzpostavljenih razmer. Tolerantni hibrid ob zmernem povečanju VPD hitreje pripre listne reže v primerjavi z netolerantnim, kontrolne rastline pa hitreje od megljenih rastlin. Pri prenosu iz manjšega na večji VPD nezalite rastline bolj omejujejo prevodnost listnih rež kot zalite. Tolerantni hibrid in rastline, rastoče v stresnejših razmerah, izkazujejo večjo občutljivost listnih rež. The vapor pressure deficit (VPD) between the leaf and the atmosphere is the driving force behind transpiration, which supplies plants with water and nutrients, but at the same time causes water to be lost from the plant. As the atmosphere warms, the VPD increases, and with it, water loss. Plants regulate their water balance by opening and closing their stomata. Their response to environmental conditions, such as soil or atmospheric drought, varies from plant species to species and depends, among other factors, on the anatomical structure of the stomata. In this study, we investigated the dynamics of stomatal response to changes in VPD in two corn hybrids that are classified as having different levels of drought tolerance ('P8834' Aquamax and 'P9363'; Corteva Agriscience™). Half of the plants were exposed to misting (lower VPD) for a few hours each day, while the other half grew under actual conditions (higher VPD); in part of the experiment, the plants were also watered differently. We investigated the effects of acclimation to lower VPD, hybrids, and substrate moisture on the anatomy of leaf stomata and their response to different VPD values; however, due to fogging that was not intense enough and insufficiently controlled, we were unable to achieve the desired range of VPD values. The anatomy of the stomata differed between the hybrids from the outset, and after acclimatization, further changes occurred between the treatments; however, we cannot assert that this was a result of the conditions we established. With a moderate increase in VPD, the tolerant hybrid closes its stomata more quickly than the intolerant hybrid, while the control plants close their stomata more quickly than the mist-treated plants. When transferred from a lower to a higher VPD, non-irrigated plants restrict stomatal conductance more than irrigated plants. The tolerant hybrid and plants growing under more stressful conditions exhibit greater stomatal sensitivity. deficit tlaka vodne pare (VPD) aklimatizacija prevodnost listnih rež anatomija listnih rež koruza vapor pressure deficit (VPD) acclimation stomatal conductivity stomatal anatomy maize true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2026-10-02 07:16:57 2026-10-02 07:17:01 2026-10-12 15:43:57 0000-00-00 00:00:00 2026 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 293295 294816515 62750.pdf 62750.pdf 1 915839C73A9E58637A75F044B9938EA8 8b6f7f29ec4983f6a6c66e27ae7fcf59d6cd1f44862e9d88331ac76bbf4f4211 62b73c28-be20-11f1-8bc5-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=249584 Biotehniška fakulteta 0 0 0