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Discovering the type of seed dormancy and temperature requirements for seed germination of Gentiana lutea ***(Gentianaceae)

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Journal of Plant Ecology 2018年第2期11卷 308-316页

作者： Alba Cuena-Lombraña Marco Porceddu Caterina Angela Dettori1 and Gianluigi Bacchetta1 21 Centro Conservazione BiodiversitàDipartimento di Scienze della Vita e dell’AmbienteUniversitàdegli Studi di CagliariViale S.Ignazio da Laconi11-13Cagliari 09123Italy Banca del Germoplasma della Sardegna(BG-SAR) Hortus Botanicus Karalitanus(HBK)Universitàdegli Studi di Cagliari.Viale Sant’Ignazio da Laconi9-11Cagliari 09123Italy

Aims There are a number of mechanisms that regulate germination;among these,seed dormancy,one of the most important,is an adaptative mechanism in plants to promote survival by dispersing germination in space and time until environmental conditions are favourable for *** main goals of this study were to determine the tem-perature requirements for seed dormancy release and germination of Gentiana lutea ***,to identify the class and level of seed dormancy and to suggest an optimal germination *** Seeds belonging to two different localities were subjected to vari-ous pre-treatments,including cold stratification(0 and 5°C),warm stratification(25/10°C)and different combinations of these,and then incubated at a range of constant temperatures(5-25°C)and 25/10°*** growth during pre-treatments and incubation con-ditions were assessed at different times by measuring the embryo to seed length ratio(E:S ratio).The final germination percentage(FGP)and the germination rate(t50)were *** Findings Fleshy mature seeds of *** *** have linear under-developed *** stratification at 0°C was effective in overcoming the physiological dormancy(PD)and promoted embryo growth and subsequent *** cold stratifica-tion at 0°C,both the root and the shoot emerged readily under a wide range of *** *** seeds showed an intermediate complex morphophysiological dormancy(MPD).As regards the optimal germination protocol for this taxon,we suggest a period of cold stratification at ca.0°C followed by seed incuba-tion at 10-20°*** optimal germination temperatures found for seeds of this taxon,as well as its pre-chilling requirement at 0°C,suggest that it is well adapted to a temperate climate;this behavior highlights an increasing threat from global warming for ***,which could reduce the level of natural emergence in the field,prejudicing also the long-term persistence of the natural popula-t

关键词： embryo growth global warming morphophysiological dormancy pre-chilling requirement seed germination threatened species

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Germination and Photosynthetic Responses to Salinity and Alkalinity in Avicenna marina Propagules

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Phyton-International Journal of Experimental Botany 2022年第5期91卷 1015-1026页

作者： Abdallah Atia Ahmed Abdallah Hussain Barhoumi Zouhaier Department of Biology College of Arts and Science Mahayel AsirKing Khalid UniversityAbha61413Saudi Arabia Research Unit Nutrition and Nitrogen Metabolism and Stress ProteinDepartment of BiologyFaculty of Sciences of TunisCampus Universitaire El Manar ITunis1068Tunisia Department of Biology King Khalid UniversityAbha61413Saudi Arabia Faculty of Science Abu HarazGezira UniversityWed Medani21111Sudan Laboratory of Extremophile Plants Biotechnology Center of Borj CedriaUniversity Tunis El ManarTunis1068Tunisia

Avicenna marina(Forssk.)Vierh is a halophytic *** reproductive unit is green and has photosynthetic *** are naturally exposed to fluctuations in some abiotic factors at the soil surface,including salinity and *** objective of this study was to determine the effects of two salts including NaCl and NaHCO_(3)on germination processes and discuss the relationships between cotyledon photosynthesis and embryo axis growth in *** *** propagules came from Al Birk,located on the shoreline of the Saudi Red *** results showed that the studied salts did not affect neither the final germination percentage nor the embryo axis ***,rooting and root growth were delayed by both salts at 300 mM and were strongly inhibited by 600 mM NaHCO_(3).Both NaCl and NaHCO_(3)reduced the photosynthetic *** two salts did not affect the other photosynthetic parameters,including stomatal conductance,net transpiration,and intercellular CO_(2).Thereafter,the reduction in net photosynthesis was not related to any limitation of stomatal *** early germination phase was independent of cotyledon photosynthesis,whereas rooting and root growth may be limited by reduced photosynthesis under NaCl and NaHCO_(3).

关键词： Avicenna marina propagules cotyledons embryo growth germination photosynthesis alkalinity salinity

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Sequential temperature control of multi-phasic dormancy release and germination of Paeonia corsica seeds

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Journal of Plant Ecology 2016年第4期9卷 464-473页

作者： Marco Porceddu Efisio Mattana Hugh W.Pritchard Gianluigi Bacchetta Centro Conservazione Biodiversità(CCB) Dipartimento di Scienze della Vita e dell’AmbienteUniversitàdegli Studi di Cagliari.Viale Sant’Ignazio da Laconi1309123CagliariItaly Royal Botanic Gardens KewWellcome Trust Millennium BuildingWakehurst PlaceArdinglyWest Sussex RH176TNUK

Aims The physiological responses during dormancy removal and multi-phasic germination were investigated in seeds of Paeonia corsica(Paeoniaceae).Methods Seeds of *** were incubated in the light at a range of temperatures(10-25 and 25/10℃),without any pre-treatment,after W(3 months at 25℃),C(3 months at 5℃)and W+C(3 months at 25℃followed by 3 months at 5℃)stratification,and a GA_(3)treatment(250 mg·l^(−1)in the germination substrate).embryo growth,time from testa to endosperm rupture and radicle emergence were assessed as separate ***-plumule emergence was evaluated incubating the germinated seeds at 15℃for 2 weeks,at 5 and 25℃for 2 months on agar water before transplanting to the soil substrate at 10,15 and 20℃and at 15℃for 2 months on the surface agar water with GA_(3).Important Findings embryo growth,testa rupture,endosperm rupture(radicle emergence)and growth of the epicotyl were identified as four sequential steps in seeds of *** acid alone and warm stratification followed by 15℃promoted embryo growth and subsequent seed *** stratification induced secondary dormancy,even when applied after warm *** radicle emergence,epicotyl-plumule emergence was delayed for ca.3 *** time of epicotyl-plumule emergence was positively affected by cold stratification(2 months at 5℃)and GA_(3).*** seeds exhibited differential temperature sensitivity for the four sequential steps in the removal of dormancy and germination processes that resulted in the precise and optimal timing of seedling emergence.

关键词： cold/warm stratification embryo growth epicotyl dormancy seed dormancy Paeoniaceae

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Comparison of prechilling stratification and sulfuric acid scarification on seed germination of Panicum virgatum under drought stress

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Frontiers of Agricultural Science and Engineering 2017年第2期4卷 220-227页

作者： Nan WANG Jing GAO Suiqi ZHANG Feng YAN Shaanxi Collaborative Innovation Center of Chinese Medicinal Resources Industrialization Shaanxi University of Chinese Medicine Institute of Soil and Water Conservation Northwest A&F University College of Pharmacy Shaanxi University of Chinese Medicine

In semi-arid regions of the Loess Plateau,water deficiency restricts plant performance. Panicum virgatum(switchgrass), which is a highly versatile grass,had been introduced to the Plateau as a restoration *** determine if prechilling stratification(PCS) and sulfuric acid scarification(SAS) can optimize establishment,P. virgatum cvs Pathfinder, Trailblazer and Alamo were tested under different ambient water potentials by measuring germination and root and shoot growth along water potential gradients under laboratory conditions. Both PCS and SAS improved total germination percentage(TGP), with PCS being more beneficial. The effect of PCS and SAS on mean germination time(MGT) weakened gradually with increasing drought stress. Both PCS and SAS showed no obvious effect on promoting root and shoot growth. Both PCS and SAS reduced base water potential requirement for reaching 50% germination of Pathfinder and Trailblazer, with this effect greater for *** results indicate that embryo dormancy may be a major factor limiting germination of P. virgatum under drought conditions. Pathfinder appears to be more suitable for a semi-arid environment, whereas Alamo appears to be unsuitable for drought conditions. Given the large difference between predicted value and measured value,the reliability and applicable scope of linear regression estimated ψ_(50) needs further investigation, specification and optimization.

关键词： base water potential data analysis method embryo growth germination

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