2024-03-28T15:21:44Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/2091672023-01-18T11:42:34Zcom_10261_103com_10261_1col_10261_356
00925njm 22002777a 4500
dc
Gonzalo, Maria José
author
Li, Yi-Chen
author
Chen, Kai-Yi
author
Gil, David
author
Montoro, Teresa
author
Nájera, Inmaculada
author
Baixauli, Carlos
author
Granell, Antonio
author
Monforte, Antonio J.
author
2020-04-24
Global climate change is increasing the range of temperatures that crop plants
must face during their life cycle, giving negative effects to yields. In this changing
scenario, understanding the genetic control of plant responses to a range of increasing
temperature conditions is a prerequisite to developing cultivars with increased resilience.
The current work reports the identification of Quantitative Trait Loci (QTL) involved
in reproductive traits affected by temperature, such as the flower number (FLN) and
fruit number (FRN) per truss and percentage of fruit set (FRS), stigma exsertion (SE),
pollen viability (PV) and the incidence of the physiological disorder tipburn (TB).These
traits were investigated in 168 Recombinant Inbred Lines (RIL) and 52 Introgression
Lines (IL) derived from the cross between Solanum lycopersicum var. “MoneyMaker”
and S. pimpinellifolium accession TO-937. Mapping populations were cultivated under
increased temperature regimen conditions: T1 (25 C day/21 C night), T2 (30 C
day/25 C night) and T3 (35 C day/30 C night). The increase in temperature drastically
affected several reproductive traits, for example, FRS in Moneymaker was reduced
between 75 and 87% at T2 and T3 when compared to T1, while several RILs showed a
reduction of less than 50%. QTL analysis allowed the identification of genomic regions
affecting these traits at different temperatures regimens. A total of 22 QTLs involved
in reproductive traits at different temperatures were identified by multi-environmental
QTL analysis and eight involved in pollen viability traits. Most QTLs were temperature
specific, except QTLs on chromosomes 1, 2, 4, 6, and 12. Moreover, a QTL located
in chromosome 7 was identified for low incidence of TP in the RIL population, which
was confirmed in ILs with introgressions on chromosome 7. Furthermore, ILs with
introgressions in chromosomes 1 and 12 had good FRN and FRS in T3 in replicated
trials. These results represent a catalog of QTLs and pre-breeding materials that could
be used as the starting point for deciphering the genetic control of the genetic response
of reproductive traits at different temperatures and paving the road for developing new
cultivars adapted to climate change.
Frontiers in Plant Science 11:326
http://hdl.handle.net/10261/209167
10.3389/fpls.2020.00326
http://dx.doi.org/10.13039/501100000780
32391023
Pollen viability
Fruit set
QTL
Introgression line
Tip burn
Abiotic stress
Genetic control of reproductive trraits in tomatoes under high temperature