Programmed cell death during floral nectary senescence in Ipomoea purpurea

Gui, Mengyuan; Liu, Wenzhe

doi:10.1007/s00709-013-0570-3

Cited by 12 publications

(9 citation statements)

References 44 publications

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“…Degradation of the mitochondrion bilayer membrane is also a typical PCD characteristics. This finding is similar to the mitochondrion membrane degradation observed during the floral nectary senescence in Ipomoea purpurea (Gui & Liu, 2014) and wheat ( Triticum aestivun L.) endosperm cells during drought stress (Li et al, 2018). Vacuole rupture and degradation of vacuole membranes are also common characteristics of PCD, and they may be responses to invasion by some pathogens.…”

Section: Discussionsupporting

confidence: 84%

Programmed cell death during the formation of rhytidome and interxylary cork in roots of Astragalus membranaceus (Leguminosae)

Han

Zhou

et al. 2021

Microscopy Res & Technique

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Programmed cell death (PCD) plays a critical role throughout the lives of plants, it is regarded as a highly regulated and active process of plant cell death during the times of biotic or abiotic stress. This study aims to provide developmental anatomical characteristics of the interxylary cork formation in the roots of Astragalus. membranaceus var. mongholicus, and to subsequently show cytomorphological evidence that PCD is involved in the development of rhytidome and interxylary cork. The developmental anatomy of rhytidome and interxylary cork of the perennial fresh main root of A. membranaceus var. mongholicus was studied using light microscopy, whereas the PCD in the development of rhytidome and interxylary cork was studied using fluorescence microscopy and transmission electron microscopy. Histologically, it was observed that the parenchyma cells of secondary phloem and xylem in roots recovered their meristematic ability, and later developed into rhytidome and interxylary cork. Cytologically, ultrastructural characteristics such as nucleus malformation, vacuole disappearance, mitochondrial degeneration, and vesicle filling were observed. In roots, the nucleus of the phloem parenchyma cells were terminal deoxynucleotidyl transferase‐mediated dUTP nick‐end labeling (TUNEL)‐positive from the pre‐rhytidome stage to the formation of rhytidome stage and 4′,6‐diamidino‐2‐phenylindole dihydrochloride (DAPI)‐negative during the mature rhytidome stage. The TUNEL assay of the xylem parenchyma cells showed positive characteristics from the early stage of interxylary cork formation to the interxylary cork formation stage, whereas DAPI‐negative characteristics were observed in the mature interxylary cork. Gel electrophoresis showed that DNA cleavage was random. Our results indicated that the formation of the rhytidome and interxylary cork involved the PCD process.

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Section: Discussionsupporting

confidence: 84%

Programmed cell death during the formation of rhytidome and interxylary cork in roots of Astragalus membranaceus (Leguminosae)

Han

Zhou

et al. 2021

Microscopy Res & Technique

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“…The micromorphological and anatomical features of the nectary disc found in R. ornata were generally similar to those of other species in the family, as described in previous studies, both in terms of nectary tissue composition and vascularization [ 29 , 30 , 65 , 66 ]. The secretion of nectar through modified stomata (i.e., nectarostomata) is common among flowering plants across diverse, taxonomically distant species [ 67 ].…”

Section: Discussionsupporting

confidence: 83%

“…Schum.) A. Robyns in the Malvaceae family) [ 36 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 , 87 , 88 , 89 , 90 , 91 , 92 , 93 , 94 , 95 , 96 , 97 ,…”

Section: Discussionunclassified

Functional Ecology of External Secretory Structures in Rivea ornata (Roxb.) Choisy (Convolvulaceae)

Chitchak

Stewart

Traiperm

2022

Plants

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Plants have evolved numerous secretory structures that fulfill diverse roles and shape their interactions with other organisms. Rivea ornata (Roxb.) Choisy (Convolvulaceae) is one species that possesses various external secretory organs hypothesized to be ecologically important. This study, therefore, aimed to investigate five secretory structures (nectary disc, petiolar nectaries, calycinal glands, staminal hairs, and foliar glands) using micromorphology, anatomy, histochemistry, and field observations of plant–animal interactions in order to assess the functional contributions of these structures. Results show that the nectary disc and petiolar nectaries are complex working units consisting of at least epidermis and ground tissue, while the other structures are glandular trichomes. Various groups of metabolites (lipids, phenolic compounds, polysaccharides, terpenoids, flavonoids, and alkaloids) were detected in all structures, while starch grains were only found in the nectary disc, petiolar nectaries, and their adjacent tissues. Integrating preliminary observation of animal visitors with micromorphological, anatomical, and histochemical results, two hypotheses are proposed: (I) nectary disc and staminal hairs are important for pollination as they potentially attract and reward floral visitors, and (II) petiolar nectaries, calycinal glands, and foliar glands contribute to plant defense. Specifically, petiolar nectaries and calycinal glands provide protection from herbivores via guard ants, while calycinal and foliar glands may use plant metabolites to help prevent tissue damage from dehydration and insolation.

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“…In a previous study, we found that the bright colour of I. purpurea during blooming induces pollinators to visit the flowers, and the abundant nectary‐secreted nectar might be a reward for pollinator visiting behaviour, stimulating cross‐pollination (Gui & Liu 2014). Pollen germination and pollen tube growth are critical processes for sexual reproduction in angiosperms.…”

Section: Discussionmentioning

confidence: 99%

Doubly guaranteed mechanism for pollination and fertilization in Ipomoea purpurea

Liu

Gui²,

Sun

et al. 2020

Plant Biol J

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• Flowers, the reproductive organs of angiosperms, show a high degree of diversity in morphological structure and flowering habit to ensure pollination and fertilization of the plants. Effect of flower movement on pollination and fertilization was investigated in Ipomoea purpurea (Convolvulaceae) in this study. • Fluorescence microscopy was used to observe the germination of pollen grains at different temperatures. • From 04:00 to 06:00 h, the stigma was taller than the filaments, so that self-pollination could not occur, and cross-pollination was carried out by insects. Pollen grains germinated rapidly after falling on the stigma; the pollen tube reached the ovule to complete fertilization after 2-3 h. From 07:00 to 09:00 h, filaments of two stamens grew rapidly and reached the same height as the stigma, thus allowing self-crossing. But at this time, the ambient temperature was already high and was not conducive to the germination of pollen grains. The corolla closed, forming an inverted bell shape, where the inner microenvironment ensured completion of pollen germination and fertilization. • Preferential cross-pollination and delayed self-crossing of I. purpurea provided a doubly guaranteed mechanism for pollination and fertilization, facilitating its adaptation to a high temperature climate.

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Programmed cell death during floral nectary senescence in Ipomoea purpurea

Cited by 12 publications

References 44 publications

Programmed cell death during the formation of rhytidome and interxylary cork in roots of Astragalus membranaceus (Leguminosae)

Programmed cell death during the formation of rhytidome and interxylary cork in roots of Astragalus membranaceus (Leguminosae)

Functional Ecology of External Secretory Structures in Rivea ornata (Roxb.) Choisy (Convolvulaceae)

Doubly guaranteed mechanism for pollination and fertilization in Ipomoea purpurea

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