Naslov
Chlorophyll a fluorescence during flag leaf senescence of field-grown winter wheat plants under drought conditions

Autori
Španić, Valentina ; Šunić, Katarina ; Duvnjak, Jurica ; Yin-Gang, Hu ; Katanić, Zorana

Kolaboracija
Bilateralna suradnja Hrvatska-Kina

Izvornik
Annals of applied biology (0003-4746) Online (2023), Online; 1-22

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
abiotic stress ; chlorophyll fluorescence ; drought ; grain yield ; OJIP ; wheat production

Sažetak
Improving wheat grain yield plays a significant role in ensuring global food security. Wheat production could be increased by the genetic improvement of wheat genotypes where delayed senescence with enhanced post-anthesis capacity and stay green traits could have an important role. In this study, chlorophyll a fluorescence (ChlF) rise kinetics from the early until late senescence of flag leaves, grain yield, and other agro-morphological characteristics were compared for three winter wheat advanced lines (Osk.4.312/10–18, Osk.4.330/6–18, and Osk.4.354/12–18) under natural drought conditions. The differences between lines were observed when considering the heading date which was one and four days earlier for the line Osk.4.354/12–18, than lines Osk.4.312/10–18 and Osk.4.330/6–18, respectively. Furthermore, line Osk.4.354/12–18 had the highest test weight (kg hl−1), while line Osk.4.330/6–18 showed a tendency of decreased grain yield, compared to the other two lines. Analysis of ChlF transients and several JIP-test parameters indicated that all three lines had a generally similar course of changes in the photosynthetic performance of flag leaves during senescence under drought conditions. However, at the point when a decrease in photosynthetic performance was initiated, it was slightly less intensive in line Osk.4.354/12–18 accompanied by longer preservation of functionality and connectivity of PSII units, than in the other two lines, which contributed to its better agronomical performance. These results indicated that even delicate variations in the functioning of the photosynthetic apparatus of the flag leaf during grain filling were agronomically important, especially when plants were exposed to drought stress, and could be used to differentiate otherwise similar wheat genotypes. Even small genotype-specific differences in the photosynthetic performance of senescing flag leaves, along with earlier heading dates, could assist in the selection of genotypes with a better ability to cope with unfavorable environmental conditions.

Izvorni jezik
Engleski

Znanstvena područja
Biologija, Poljoprivreda (agronomija), Biotehnologija

POVEZANOST RADA