Naslov
QTL for photosynthetic and yield performance in IBM population under two different heat scenarios during flowering time

Autori
Galić, Vlatko ; Franić, Mario ; Jambrović, Antun ; Ledenčan, Tatjana ; Šimić, Domagoj

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

Izvornik
60th Annual Maize Genetics Conference Program and Abstracts / - : EUCARPIA, 2018, 183-183

Skup
60th Annual Maize Genetics Conference

Mjesto i datum
Saint-Malo, Francuska, 22.03.2018. - 25.03.2018

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Maize, QTL, heat scenario, VPD

Sažetak
It was demonstrated that extreme heat as a stressor could have more critical role for maize production than drought in temperate areas. Accumulation of extreme temperatures (>30°C) is associated with increased vapor pressure deficit (VPD) as a function of temperature and relative humidity used recently in maize genetic studies. The objectives of this three-year study were 1) to compare photosynthetic performance during flowering with grain yield, and 2) to analyze quantitative trait loci (QTL) for the performance in testcrosses of IBM population under two different heat scenarios. PIABS - performance index for energy conservation from photons absorbed by PSII to the reduction of intersystem electron acceptors was used as a parameter for the photosynthetic performance. Two distinct geographic regions of Croatia (Osijek) and Turkey (Ayvalik) differed considerably in VPD during flowering time (in average 2.5±0.3 and 3.4±0.3 kPa, respectively). The correlations between PIABS and yield were notably stronger in environments with higher VPD (Turkey) reaching r=0.59. Inclusive composite interval mapping (ICIM) revealed a larger number of significant, but mostly environmentally dependent QTLs for PIABS and grain yield. Some of them were associated to tolerance to heat stress because they were specific to heat scenarios. Our complete quantitative genetic analysis for series of photosynthetic and agronomic traits will be used for assessing the photosynthetic performance of maize genotypes as a function of grain yield in heat stress environments.

Izvorni jezik
Engleski

Znanstvena područja
Biologija, Poljoprivreda (agronomija)

POVEZANOST RADA