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SODININKYSTË IR DARÞININKYSTË. MOKSLO DARBAI. 2006. <strong>25</strong>(4).<br />
UV SUGERIANÈIØ PIGMENTØ POKYÈIAI AUGALØ<br />
LAPUOSE VEIKIANT UV-B SPINDULIUOTEI<br />
K. Baranauskis, J. Sakalauskaitë, A. Brazaitytë, A. Urbonavièiûtë, G. Samuolienë,<br />
G. Ðabajevienë, J. B. Ðikðnianienë, P. Duchovskis<br />
Santrauka<br />
Tyrimo metu buvo stebimi UV sugerianèiø pigmentø pokyèiai Daucus sativus<br />
Röhl., Fragaria ananassa Duch. Malus domestica <strong>ir</strong> Raphanus sativus L. augalø<br />
lapuose, veikiant 2 <strong>ir</strong> 4 kJ UV-B dienos dozëmis. Taip pat nustatyta UV sugerianèiø<br />
pigmentø kaita Malus domestica <strong>ir</strong> Raphanus sativus L. augalø lapuose, veikiant<br />
UV-B, aukðtai temperatûrai (+ <strong>25</strong>°C dienà <strong>ir</strong> + 16°C naktá) <strong>ir</strong> padidintai CO 2<br />
koncentracijai<br />
(700 ppm). Nustatyta, kad augalo atsakas á UV-B spinduliuotæ itin priklauso<br />
nuo augalo rûðies tik tada, kai nëra papildomo streso poveikio, t. y. kai yra palanki<br />
augalams augti temperatûra (+ 21°C dienà <strong>ir</strong> + 14°C naktá) bei natûrali CO 2<br />
koncentracija.<br />
Taèiau tokiomis sàlygomis nepavyko nustatyti tiesioginio priklausomumo tarp<br />
UV sugerianèiø pigmentø kiekio <strong>ir</strong> UV-B spinduliuotës poveikio intensyvumo. Ávertinus<br />
tyrimø rezultatus, galima teigti, jog UV sugerianèiø pigmentø kiekis augalø lapuose<br />
labiau priklauso nuo tokiø veiksniø kaip aukðta temperatûra ar padidëjusi CO 2<br />
koncentracija nei tiesioginis UV-B spinduliuotës poveikis.<br />
Reikðminiai þodþiai: Daucus sativus Röhl., Fragaria ananassa Duch. Malus<br />
domestica, Raphanus sativus L., UV sugeriantys pigmentai, UV-B spinduliuotë.<br />
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