Spike developmental stages and ABA role in spikelet primordia abortion contribute to the final yield in barley (Hordeum vulgare L.)

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Spike developmental stages and ABA role in spikelet primordia abortion contribute to the final yield in barley (Hordeum vulgare L.). / Boussora, Faiza; Allam, Mohamed; Guasmi, Ferdaous; Ferchichi, Ali; Rutten, Twan; Hansson, Mats; Youssef, Helmy M.; Börner, Andreas.

I: Botanical Studies, Vol. 60, Nr. 1, 13, 12.2019.

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Boussora, Faiza ; Allam, Mohamed ; Guasmi, Ferdaous ; Ferchichi, Ali ; Rutten, Twan ; Hansson, Mats ; Youssef, Helmy M. ; Börner, Andreas. / Spike developmental stages and ABA role in spikelet primordia abortion contribute to the final yield in barley (Hordeum vulgare L.). I: Botanical Studies. 2019 ; Vol. 60, Nr. 1.

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TY - JOUR

T1 - Spike developmental stages and ABA role in spikelet primordia abortion contribute to the final yield in barley (Hordeum vulgare L.)

AU - Boussora, Faiza

AU - Allam, Mohamed

AU - Guasmi, Ferdaous

AU - Ferchichi, Ali

AU - Rutten, Twan

AU - Hansson, Mats

AU - Youssef, Helmy M.

AU - Börner, Andreas

PY - 2019/12

Y1 - 2019/12

N2 - Background: Salinity is a significant environmental stress factor limiting crops productivity. Barley (Hordeum vulgare L.) has a natural tolerance to salinity stress, making it an interesting study object in stress biology research. In the present study, for the first time the effect of salinity stress on barley inflorescence developmental stages was investigated. Five spring barley genotypes irrigated with saline water (12.5 ds/m NaCl) were compared to controls treated with normal tap water. We measured abscisic acid (ABA) concentrations in the apical, central and basal sections of the immature inflorescence at green anther (GA) stage. The role of ABA in spikelet primordia development, atrophy and abortion and final yield was evaluated. Results: A time course experiment starting from double ridge until green anther (GA) stages revealed that salinity reduced the length of spike developmental stages in all genotypes causing shortened of the plant life cycle. The shortened plant life cycle negatively affected plant height and number of tillers/plant. Salinity also affected spikelet primordia development. In both control and salinity treated plants apical spikelet abortion started in late awn primordium (AP) stage. However, under salinity treatment, significantly more spikelets were aborted, thus directly affecting plant yield potential. ABA, which plays a role in the spikelet/floret abortion process, was markedly elevated in the base and apex of salt treated spikes correlating with an increased spikelet abortion in these regions. Conclusions: Overall, salinity treatment reduced all plant and yield-related parameters investigated and turned some of the correlations among them from positive to negative or vice versa. Investigations of ABA role in floral development and phase duration of barley spike showed that, ABA regulates the spikelet/floret abortion process affecting the yield potential under salinity and control conditions.

AB - Background: Salinity is a significant environmental stress factor limiting crops productivity. Barley (Hordeum vulgare L.) has a natural tolerance to salinity stress, making it an interesting study object in stress biology research. In the present study, for the first time the effect of salinity stress on barley inflorescence developmental stages was investigated. Five spring barley genotypes irrigated with saline water (12.5 ds/m NaCl) were compared to controls treated with normal tap water. We measured abscisic acid (ABA) concentrations in the apical, central and basal sections of the immature inflorescence at green anther (GA) stage. The role of ABA in spikelet primordia development, atrophy and abortion and final yield was evaluated. Results: A time course experiment starting from double ridge until green anther (GA) stages revealed that salinity reduced the length of spike developmental stages in all genotypes causing shortened of the plant life cycle. The shortened plant life cycle negatively affected plant height and number of tillers/plant. Salinity also affected spikelet primordia development. In both control and salinity treated plants apical spikelet abortion started in late awn primordium (AP) stage. However, under salinity treatment, significantly more spikelets were aborted, thus directly affecting plant yield potential. ABA, which plays a role in the spikelet/floret abortion process, was markedly elevated in the base and apex of salt treated spikes correlating with an increased spikelet abortion in these regions. Conclusions: Overall, salinity treatment reduced all plant and yield-related parameters investigated and turned some of the correlations among them from positive to negative or vice versa. Investigations of ABA role in floral development and phase duration of barley spike showed that, ABA regulates the spikelet/floret abortion process affecting the yield potential under salinity and control conditions.

KW - ABA

KW - Barley

KW - Primordia abortion

KW - Salinity

KW - Spike development

KW - Spikelet/floret abortion

UR - http://www.scopus.com/inward/record.url?scp=85068750927&partnerID=8YFLogxK

U2 - 10.1186/s40529-019-0261-2

DO - 10.1186/s40529-019-0261-2

M3 - Article

VL - 60

JO - Botanical Studies

T2 - Botanical Studies

JF - Botanical Studies

SN - 1817-406X

IS - 1

M1 - 13

ER -