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Agricultural Sciences in China 2010年第2期9卷 191-198页

作者： Muhammad Farooq Shahzad M A Basra Abdul Wahid Nazir Ahmad Department of Agronomy University of AgricultureFaisalabad Department of Crop Physiology University of AgricultureFaisalabad Department of Botany University of AgricultureFaisalabad

In this study influence of different seed priming treatments on the nutrient-homeostasis and reserve metabolism during seedling emergence and growth of rice were determined. Seed priming treatments included pre-germination, hydropriming for 48 h, osmohardening with KCl and CaCl2, ascorbate priming and hardening. All treatments shortened the emergence time and enhanced the energy and index of seedling emergence. seedlings from primed seeds had greater length, number of roots and fresh and dry mass than control. Among the treatments, CaCl2, ascorbate and KCl proved better in enhancing emergence and seedling growth. Seed priming changed the pattern of N and Ca^2＋ homeostasis both of the seeds and seedlings, which were associated to enhancing s-amylase activity and reducing sugars content. Positive correlations of seedling attributes with nutrient content suggested that as a result of seed priming, most of N and Ca^2＋ were partitioned to embryo, which enhanced seedling emergence and subsequent growth of rice seedlings.

关键词： rice α-amylase activity nutrient homeostasis seedling emergence seedling vigor

Germination and early seedling growth of Pinus densata ***

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Journal of Forestry Research 2016年第2期27卷 283-294页

作者： Yulan Xu Nianhui Cai Bin He Ruili Zhang Wei Zhao Jianfeng Mao Anan Duan Yue Li Keith Woeste Key Laboratory for Forest Resources Conservation and Usein the Southwest Mountains of China College of ForestrySouthwest Forestry UniversityKunming 650224China The State Engineering Laboratory for Tree Breeding Collegeof Biological Science and BiotechnologyBeijing Forestry UniversityBeijing 100083China State Key Laboratory of Systematic and Evolutionary Botany Institute of BotanyChinese Academy of ScienceBeijing 100093China USDA Forest Service Hardwood Tree Improvement and Regeneration Center at Purdue University West LafayetteIN 47906USA

We studied seed germination and early seedling growth of Pinus densata to explore the range of variability within the species and to inform afforestation practices. Phenotypes were evaluated at a forest tree nursery under conditions that support Pinus yunnanensis, one of the presumed parental species of P. densata. Seeds were col- lected from 20 open-pollinated trees within each of eight autochthonous populations representing the natural distri- bution of P. densata in China to assess variation in ger- mination traits and early seedling growth, and to examine the relationships among these traits. Results showed that seeds from all populations germinated and seedlings established successfully. There were significant differences among populations in 13 of 14 traits evaluated. Seed germination and early seedling growth were strongly related to seed size and seed weight. Bigger seeds germi- nated earlier and faster than small seeds, and seedling size was positively correlated with seed size. Some germination traits were strongly and significantly correlated with cli- matic variables associated with the provenance of the studied populations. Based on these observations, we conclude there were large, significant, and biologically important differences among P. densata populations in seed germination and seedling growth traits. The observed variability probably reflects a high degree of adaptive dif- ferentiation among populations that is likely to be relevant for future afforestation.

关键词： Afforestation Conifer Gaoshan pine Provenance Seed germination Seed size seedling vigor

Thermal Hardening： A New Seed vigor Enhancement Tool in Rice

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Journal of Integrative Plant Biology 2005年第2期47卷 187-193页

作者： MuhammadFAROOQ S.M.A.BASRA NazirAHMAD K.HAFEEZ DepartmentofCropPhysiology UniversityofAgricultureFaisalabad-38040Pakistan

Abstract: In a laboratory study, indica and japonica rice (Oryza sativa L.) seeds were exposed to thermal hardening (heating followed by chilling followed by heating; chilling followed by heating followed by chilling; heating followed by chilling or chilling followed by heating). In indica rice, heating followed by chilling followed by heating resulted in decreased mean germination time, time to start germination, electrical conductivity of seed leachates, and time to 50% germination, as well as increased germination index, energy of germination, radicle and plumule length, root length, root/shoot ratio, root fresh and dry weight, radicle and plumule growth rate, and shoot fresh weight. In japonica rice, chilling followed by heating followed by chilling performed better than all other treatments, including control.

关键词： germination indica rice japonica rice seedling vigor thermal hardening

Improving Acacia auriculiformis seedlings using microbial inoculant(Beneficial Microorganisms)

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Journal of Forestry Research 2014年第2期25卷 359-364页

作者： Bayezid M.Khan M.K.Hossain M.A.U.Mridha Assistant Professor Institute of Forestry & Environmental SciencesUniversity of Chittagong Institute of Forestry & Environmental Sciences University of Chittagong Plant Production Department King Saud University

A microbial inoculant, known as effective microorganisms （EM）, was applied to determine its efficacy on seed germination and seedling growth in the nursery of Acacia auriculiformis A Curm. ex Benth. The seedlings were grown in a mixture of sandy soil and cow dung （3：1） and kept in polybags; EM was poured at different concentra- tions （0.1%, 0.5%, 1%, 2%, 5% and 10%）. Seed germination rate and growth parameters of seedlings - shoot and root lengths, fresh and dry weights of shoots and roots, vigor, volume, and quality indices and stur- diness - were measured. The nodulation status influenced by EM was also observed, along with the measurement ofpigrnent contents in leaves. The highest germination rate （72%） was observed in 2% EM solution while the lowest （55%） was found in control treatment. The highest shoot and root lengths （30.6 cm and 31.2 cm respectively） were recorded in 2% EM and were significantly （p 〈0.05） different from control. Both fresh and dry weights of shoots were maximum （8.66 g and 2.99 g respectively） in 2% EM, whereas both fresh and dry weights of root were maximum （2.56 g and 1.23 g respectively） in 5% EM solution. Although the highest vigor index, volume index, and sturdiness （4450, 628 and 67.5 respec- tively） were found in 2% EM, the highest quality index （0.455） was found in 5% EM solution. The nodule number was higher at a very low （0.5%） concentration of EM but it normally decreased with the increase of concentration. The contents of chlorophyll a, chlorophyll b, and carotenoid were maximum （43.26 mg.L-1, 13.56 mg.L-1 and 17.99 mg.L-1 respectively） in 2% EM. Therefore, low concentration of EM （up to 2%）can be recommended for getting maximum seed germination and seed- ling development ofA. auriculiformis in the nursery.

关键词： Microbial inoculant (EM) germination seedling vigor leaf's pigment nodulation status.

Seed Size as Key Factor in Germination and seedling Development of Copaifera langsdorffii(Fabaceae)

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American Journal of Plant Sciences 2014年第17期5卷 2566-2573页

作者： Matheus Lopes Souza Marcilio Fagundes Laboratorio de Biologia da Conservacao Universidade Estadual de Montes ClarosMontes ClarosBrasil Laboratorio de Fisiologia Vegetal Universidade Federal de Minas GeraisBelo HorizonteBrasil

Seed size is a plastic trait of the plants that directly affect seed germination and seedling recruitment. This study aimed to investigate the relationship between seed size, seed germinability and seedling performance of Copaifera langsdorffii by testing four hypotheses: 1) larger seeds have higher germination percentage;2) smaller seeds require less time to germinate and for initial development of the seedlings;3) larger seeds produce more vigorous seedlings and 4) seed size negatively affects seedling root/shoot ratio. In 2011, we selected 30 individuals of C. langsdorffii from which 300 seeds were randomly collected in the plant canopy. All these seeds were weighted and placed in germination tray using vermiculite as substrate. Seed germinability and initial development of seedlings were monitored daily until cotyledons fell. Small seeds have higher germination percentage and germinate faster when compared to large seeds. Nonetheless, seedlings originated from larger seeds have longer development times, resulting in more vigorous seedlings. In addition, seedlings originating from small seeds allocate proportionally greater amount of resources to roots when compared to larger seeds. The fact that small seeds have higher germination percentage and faster germination favors the colonization of transient habitats. However, larger seeds produce more vigorous seedlings, favoring the seedling establishment in more stable habitats. Thus, we argue that high variability in seed size of C. langsdorffii favors its widespread geographic distribution.

关键词： Community Organization Plant Distribution Seed Biometry Seed Reserves seedling vigor

Plant growth-promoting characteristics of root fungal endophytes isolated from a traditional Cordillera rice landrace

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Studies in Fungi 2020年第1期5卷 536-549页

作者： Pablo CHD Pagaduan JRR Langres HKC Hipol RM Department of Biology College of ScienceUniversity of the Philippines Baguio

This study was conducted to isolate and characterize the plant growth-promoting potential of fungal endophytes from the roots of Diket red,a traditional rice plant from the Cordillera,Northern *** morphospecies of filamentous endophytes were isolated of which twelve isolates were successfully identified to the species *** isolates were identified as Aspergillus versicolor,Aspergillus sp.,Chaetosphaeria sp.,Cladosporium cladosporioides,Hypocrea lixii,Microascus murinus,and Trichoderma *** identified twelve isolates were selected to screen in vitro for their plant growth-promoting characteristics,and evaluated in vivo for their beneficial effects on seedling vigor and early seedling *** PPL14 produced the highest IAA at 55.5μg ml^(-1)and *** PPL10 produced the highest amount of IAA at 3.73μg IAA mg^(-1)dry mycelia *** seedling vigor assay and in vivo plant growth promotion bioassay indicated overall positive effects of culture filtrate(CF)application of the endophyte *** seeds and seedlings grown in aseptic condition and treated with endophyte CFs displayed significantly enhanced levels of germination,seedling vigor,shoot,root,and total plant growth,and biomass compared to non-treated *** plant growth-promoting characteristics were also studied including phosphate solubilization,siderophore production,ammonia production,and catalase *** study supports the potential use of fungal endophytes as bio-inoculants for plant growth promotion and enhancement of nutrient assimilation of agriculturally important crops.

关键词： 18S rDNA Endophytic fungi Plant growth promotion Rice landrace seedling vigor

Effect of Plant Derived Smoke on Germination and Post Germination Expression of Wheat (Triticum aestivum L.)

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American Journal of Plant Sciences 2016年第6期7卷 806-813页

作者： Muhammad Iqbal Saira Asif Noshin Ilyas Naveed Iqbal Raja Mubashir Hussain Sumera Shabir Muhammad Nasim Ashraf Faz Abdul Rauf Department of Botany PMAS-Arid Agriculture University Rawalpindi Pakistan Department of Botany Government College University Faisalabad Pakistan Department of Biology AIOU Islamabad Pakistan

Smoke produced from burning of plant material elicits a striking increase in seed germination in various plant species. In present work, effect of plant derived smoke exposure on wheat (Triticum aestivum L.) seeds germination and post germination response has been studied in laboratory. Plant derived smoke was generated by burning of plant material (leaf, straws etc.) in a special designed furnace. Non-imbibed and imbibed seeds of wheat were exposed to plant derived smoke for 1 hr time duration. Best results were observed in non-imbibed seeds treated with plant derived smoke while imbibed seeds showed poor response to germination percentage, germination index, seedling vigor index and root shoot length. It has been proved from present study that plant derived smoke has stimulatory effect on germination & post germination response of non-imbibed seeds while it may cause inhibitory effect in imbibed seeds of wheat.

关键词： Plant Derived Smoke Wheat Seed Germination seedling vigor Root Shoot Length