Arabidopsis AHL15-Induced Rejuvenation Promotes Longevity and Polycarpy in Nicotiana tabacum | [Abstract Book on International Conference on Sustainable Agriculture and Food Security, August 27-31, 2023 • 2023]

Author(s):

1. Majid Khan: Molecular and Developmental Genetics, Institute of Biology Leiden, Leiden University, Sylvius Laboratory, Sylviusweg 72, 2333 BE Leiden, Netherlands; Institute of Biotechnology & Genetic Engineering, The University of Agriculture, Peshawar, 25130, Khyber Pakhtunkhwa, Pakistan

2. Omid Karami: Molecular and Developmental Genetics, Institute of Biology Leiden, Leiden University, Sylvius Laboratory, Sylviusweg 72, 2333 BE Leiden, Netherlands

3. Remko Offringa: Molecular and Developmental Genetics, Institute of Biology Leiden, Leiden University, Sylvius Laboratory, Sylviusweg 72, 2333 BE Leiden, Netherlands

Abstract:

Plant rejuvenation and senescence are interrelated and interdependent developmental processes. Early maturation and poor rejuvenation potential restricts flowering plants to a monocarpic life history strategy and thus to a seasonal life span, which is generally shortened by environmental factors such as biotic and abiotic stresses. In contrast, delay in senescence of adult shoots and rejuvenation of (axillary) shoot meristems may enhance plant longevity and allow plants to flower multiple times (polycarpy). Recently, we identified the AT-HOOK MOTIF NUCLEAR LOCALIZED PROTEIN 15/REJUVENATOR (AHL15/RJV) protein as a key switch between monocarpic and polycarpic life history strategy in Arabidopsis thaliana. Here we analyzed the effect of heterologous expression of an inducible version of AHL15 (AHL15- GR) on Nicotiana tabacum development. Early activation of AHL15-GR delayed seed germination and arrested seedling development, resulting in callus formation rather than the somatic embryogenesis observed in Arabidopsis. Late AHL15-GR activation enhanced plant longevity by reducing leaf senescence, delaying flowering, and by shoot meristem rejuvenation, leading to an increased number of branches, leaves and seeds produced per plant. But the quality of the produced seeds in polycarpic 35S: AHL15-GR tobacco plants was affected at the cost of seed quantity. Our data indicates that the overall function of AHL15 seems conserved in different families of flowering plants, but also points to specific differences that require further study before AHL15-induced polycarpy can be used as a generic tool to enhance biomass and seed production in monocarpic crop species.

Page(s): 30-30

DOI: DOI not available

Published: Journal: Abstract Book on International Conference on Sustainable Agriculture and Food Security, August 27-31, 2023 , Volume: 0, Issue: 0, Year: 2023

Keywords:

Nicotiana tabacum , AHL15

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