ORCID Profile
0000-0002-0972-2515
Current Organisations
The University of Auckland
,
USDA-ARS
,
Cornell University
,
Boyce Thompson Institute for Plant Research
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Publisher: Springer Science and Business Media LLC
Date: 29-06-2012
Publisher: Wiley
Date: 31-03-2023
DOI: 10.1111/TPJ.16168
Abstract: A level of redundancy and interplay among the transcriptional regulators of floral development safeguards a plant's reproductive success and ensures crop production. In the present study, an additional layer of complexity in the regulation of floral meristem (FM) identity and flower development is elucidated linking carotenoid biosynthesis and metabolism to the regulation of determinate flowering. The accumulation and subsequent cleavage of a erse array of ζ‐carotenes in the chloroplast biogenesis 5 ( clb5 ) mutant of Arabidopsis results in the reprogramming of meristematic gene regulatory networks establishing FM identity mirroring that of the FM identity master regulator, APETALA1 (AP1). The immediate transition to floral development in clb5 requires long photoperiods in a GIGANTEA‐independent manner, whereas AP1 is essential for the floral organ development of clb5 . The elucidation of this link between carotenoid metabolism and floral development translates to tomato exposing a regulation of FM identity redundant to and initiated by AP1 and proposed to be dependent on the E class floral initiation and organ identity regulator, SEPALLATA3 (SEP3).
Publisher: Wiley
Date: 18-05-2022
DOI: 10.1111/TPJ.15770
Abstract: Wild relatives of tomato are a valuable source of natural variation in tomato breeding, as many can be hybridized to the cultivated species ( Solanum lycopersicum ). Several, including Solanum lycopersicoides , have been crossed to S. lycopersicum for the development of ordered introgression lines (ILs), facilitating breeding for desirable traits. Despite the utility of these wild relatives and their associated ILs, few finished genome sequences have been produced to aid genetic and genomic studies. Here we report a chromosome‐scale genome assembly for S. lycopersicoides LA2951, which contains 37 938 predicted protein‐coding genes. With the aid of this genome assembly, we have precisely delimited the boundaries of the S. lycopersicoides introgressions in a set of S. lycopersicum cv. VF36 × LA2951 ILs. We demonstrate the usefulness of the LA2951 genome by identifying several quantitative trait loci for phenolics and carotenoids, including underlying candidate genes, and by investigating the genome organization and immunity‐associated function of the clustered Pto gene family. In addition, syntenic analysis of R2R3MYB genes sheds light on the identity of the Aubergine locus underlying anthocyanin production. The genome sequence and IL map provide valuable resources for studying fruit nutrient/quality traits, pathogen resistance, and environmental stress tolerance. We present a new genome resource for the wild species S. lycopersicoides , which we use to shed light on the Aubergine locus responsible for anthocyanin production. We also provide IL boundary mappings, which facilitated identifying novel carotenoid quantitative trait loci of which one was likely driven by an uncharacterized lycopene β‐cyclase whose function we demonstrate.
Publisher: Oxford University Press (OUP)
Date: 24-02-2021
Abstract: In contrast to climacteric fruits such as tomato, the knowledge on key regulatory genes controlling the ripening of strawberry, a nonclimacteric fruit, is still limited. NAC transcription factors (TFs) mediate different developmental processes in plants. Here, we identified and characterized Ripening Inducing Factor (FaRIF), a NAC TF that is highly expressed and induced in strawberry receptacles during ripening. Functional analyses based on stable transgenic lines aimed at silencing FaRIF by RNA interference, either from a constitutive promoter or the ripe receptacle-specific EXP2 promoter, as well as overexpression lines showed that FaRIF controls critical ripening-related processes such as fruit softening and pigment and sugar accumulation. Physiological, metabolome, and transcriptome analyses of receptacles of FaRIF-silenced and overexpression lines point to FaRIF as a key regulator of strawberry fruit ripening from early developmental stages, controlling abscisic acid biosynthesis and signaling, cell-wall degradation, and modification, the phenylpropanoid pathway, volatiles production, and the balance of the aerobic/anaerobic metabolism. FaRIF is therefore a target to be modified/edited to control the quality of strawberry fruits.
Publisher: Wiley
Date: 11-09-2017
DOI: 10.1111/PBI.12789
Publisher: Hindawi Limited
Date: 26-11-2019
DOI: 10.1111/HSC.12690
Abstract: Ageing does not reduce people's need to connect with family members, friends, and acquaintances, and neither does migration. For those older migrants living in a foreign land, connectedness with others plays a particularly important role in achieving a sense of belonging and sustaining their health and well-being. This paper explores the issues of social isolation and loneliness among older Asian migrants in New Zealand. Data were collected from in-depth semi-structured interviews with Chinese- or Korean-speaking migrants aged between 75 and 84 years (n = 10: all females), and from three focus groups consisting of Chinese- and Korean-speaking migrants (n = 10: 7 females, 3 males) and Chinese professionals (n = 5: 3 females, 2 males) between June 2016 and December 2016. The qualitative data obtained were analysed applying a thematic analysis approach using NVivo software for group analysis by a multidisciplinary research team. The findings from the study show that older Asian migrants experienced high levels of isolation and loneliness at least at some points in their migrant lives. Most participants in this study were living alone or with only their spouse, and this living arrangement was likely to provide fertile ground for isolation and loneliness to grow in the context of later-life migration. It was also observed that their lonely ageing ironically resulted from their efforts to preserve family relationships through avoiding being a burden, while allowing them a sort of space to maintain now barely connected lives. The participants revealed multiple ways of coping with lonely and isolated experiences in their limited social network, and these in idual strategies allow us to make suggestions about how best to reduce older migrants' social isolation and loneliness in the New Zealand context and beyond.
Publisher: Informa UK Limited
Date: 29-06-2023
Publisher: Informa UK Limited
Date: 07-2020
Publisher: Wiley
Date: 20-04-2020
DOI: 10.1111/PBI.13377
Location: United Kingdom of Great Britain and Northern Ireland
Location: United States of America
No related grants have been discovered for James Giovannoni.