Naslov
Variations of chlorophyll a fluorescence induced by climate changes in winter barley genotypes
(Variations of chlorophyll a fluorescence induced by climate changes in winter barley genotypes)

Autori
Mlinarić, Selma ; Begović, Lidija ; Galić, Vlatko ; Abičić, Ivan ; Lalić, Alojzije

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Botanica Serbica 42 (supplement 1), 7BBC Book of abstracts / Stevanović, Branka - Beograd : Botanica Serbica, 2018, 26-26

Skup
7th Balkan Botanical Congress

Mjesto i datum
Novi Sad, Srbija, 10.09.2018. - 14.04.2023

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Hordeum vulgare L., fluorescence, performance index, L-band, K-band, OJIP

Sažetak
Plant adaptation to climate change presents one of the major issues today. The insight into complex networks of molecular interactions controlling plant acclimation to field conditions could significantly improve chances of developing crops with enhanced tolerance to field conditions. To develop plants tolerant to a wide range of stresses, new approaches are needed to investigate the response of crops to a combination of different abiotic stresses. The main goal of breeding process is to select barley cultivars with better adaptation to diverse climate regimes. In the present study we evaluated photosynthetic performance in ten selected winter barley genotypes responding to variations in environmental conditions during growth season. To evaluate condition of the photosynthetic apparatus, fast chlorophyll a fluorescence was measured in the fi eld at three developmental stages: booting, anthesis and early grain filling. Furthermore, normalizations and subtractions of polyphasic fluorescence transients (OJIP) were made to reveal K and L-band. Lower amount of precipitation during anthesis induced instability of photosystem II (PSII) observed as positive K- band in six and positive L-band in seven genotypes. Positive inflections of these bands suggested slightly destabilization of oxygen- evolving center and light-induced antenna dissociation and lower PSII stability, respectively. At grain filling all genotypes displayed negative K and L-bands, suggesting increase of stability within PSII, as well as high energetic connectivity of PSII. However, the performance index (PIabs) continuously increased from booting to grain filling in most genotypes. At anthesis this was mainly influenced by the increase of electron transport beyond primary electron acceptor QA, while at grain filling it was attributed to the increase of density of reaction centers per chlorophyll basis. As the response to mild drought stress during anthesis, two types of barley genotypes can be distinguished: tolerant and susceptible.

Izvorni jezik
Hrvatski

Znanstvena područja
Biologija, Poljoprivreda (agronomija)

POVEZANOST RADA