Physiological characterization of leaf senescence of Jatropha curcas L. populations

Matos, Fábio Santos; Oliveria, Lucimar Rodrigues de; Freitas, Rilton Alves de; Evaristo, Anderson Barbosa; Missio, Robson Fernando; Cano, Marco Antônio Oliva; Dias, Luíz Antônio dos Santos

doi:10.1016/j.biombioe.2012.05.012

Cited by 26 publications

(20 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The search for alternatives to fossil fuels requires the evaluation of renewable sources with low environmental impact (Matos et al, 2012). Therefore, the development of appropriate techniques and raw materials for energy generation is essential.…”

Section: Introductionmentioning

confidence: 99%

Diversity and genetic parameter estimates for yield and its components in Jatropha curcas L.

et al. 2016

View full text Add to dashboard Cite

ABSTRACT. Jatropha curcas L. is one of the most promising oilseeds for biodiesel and biokerosene production, but few basic studies or breeding programs have been conducted for the species. We estimated genetic parameters and diversity based on 10 yield traits in 77 half-sib progenies of J. curcas after 52 months in the field, and evaluated correlations between them and the oil content of the seeds. The mean grain yield per plant was 377.9 g (ranging from 169.8 to 772.1 g) and the mean oil content was 36.2% (ranging from 30 to 39.6%). Moderate estimates of heritability at the mean progeny level were obtained for the length of the fruit (84.7%), length (69.1%) and width (68.2%) of the seed, and grain yield per plant (62.2%). Oil content was only positively and significantly correlated with 100-seed weight. Our study revealed a range of possible crosses to be investigated in J. curcas. Progeny production should be evaluated over several crop seasons for the accurate selection of the best progenies.

show abstract

Section: Introductionmentioning

confidence: 99%

Diversity and genetic parameter estimates for yield and its components in Jatropha curcas L.

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Akibat lebih lanjut dari senesens adalah gugur daun. Menurut Matos et al (2012), senesens mengakibatkan aktivitas fotosintesis, kandungan klorofil, aktivitas nitrat reduktase, pertumbuhan vegetatif, dan kandungan nitrogen akan menurun selama senesens. Oleh karena itu perlu dilakukan pengujian pengaruh sitokinin untuk memperlambat senesens daun selama perkembangan biji.…”

Section: Perbaikan Source Tanamanunclassified

Sinkronisasi Source dan Sink untuk Peningkatan Produktivitas Biji pada Tanaman Jarak Pagar

Mastur

2016

Bul. Tan. Tembakau, Serat & Minyak Industri

View full text Add to dashboard Cite

ABSTRAKSaat ini dunia sedang menghadapi masalah penurunan cadangan minyak dan dampak lingkungannya. Jarak pagar (Jatropha curcas L.) merupakan sumber bahan baku biodiesel yang potensial. Pengembangan jarak pagar saat ini masih terbatas disebabkan usaha tani yang belum menguntungkan terutama disebabkan produktivitas tanaman rendah. Makalah dimaksudkan untuk membahas pendekatan source dan sink untuk peningkatan produktivitas tanaman jarak pagar. Strategi penelitian untuk meningkatkan produktivitas dilakukan dengan peningkatan produksi biologi (biomassa) dan ekonomi (biji dan minyak). Produktivitas dapat meningkat jika terjadi sinergi antara source dan sink. Peningkatan source dapat dilakukan dengan meningkatkan kemampuan tanaman dalam memanen energi cahaya melalui peningkatan produksi asimilat dengan peningkatan laju fotosintesis daun individual, perbaikan arsitektur kanopi, serta memperpanjang umur produktif daun terutama selama pembentukan biji. Perbaikan sink dapat dilakukan dengan meningkatkan proporsi bunga betina, meningkatkan proporsi buah jadi, serta meningkatkan laju dan lama pembentukan biji melalui dukungan source. Perbaikan source dan sink tersebut dilakukan melalui pemilihan genotipe tanaman dengan sifat-sifat source dan sink optimal untuk dijadikan bahan perakitan varietas. Perbaikan teknologi budi daya dapat dilakukan dengan pengaturan jarak tanam yang tepat, pemangkasan, pemupukan, pengairan, dan penggunaan ZPT yang tepat baik untuk mendukung kanopi yang produktif sebagai pemasok asimilat, maupun untuk memperbesar kemampuan biji sebagai sink utama dalam memanfaatkan semaksimal mungkin pasokan asimilat untuk sintesis biji dan lemak. Dengan demikian, diharapkan diperoleh tanaman jarak pagar dengan produktivitas tinggi sebagai hasil dari produksi biomassa dan indeks panen tinggi.Kata kunci: Jarak pagar, Jatropha curcas L., biomassa, source, sink ABSTRACT Nowadays, the world is facing problem of lowering petroleum fuel stocks and its environmental impact. Physic nuts (Jatropha curcas L.) is a plant that can be used as biodiesel feedstock. Extention problem of physic nuts cropping area and its role as biodiesel source is still limited due to low economical value and low productivity. This paper elucidates source and sink and their correlation to productivity based on research. Research strategies are directed to study increase biological yield (biomass) and economical yield (seed and oil content) of physic nut. The yield can be increased by synergizing between source and sink. Alleviating source could be done by increasing the ability of plant in increasing photoshinthesis rate, arranging canopy architecture, and prolonging the age leaves especially during seed development. Sink process could be optimized through promoting number of female flower, number of seeds, and increasing seed initiation and development. The source and sink improvement can be implemented through genotype selection for breeding materials. Cultivation technology improvement can be conducted plant optimum spacing and population arra...

show abstract

“…Em relação ao nitrogênio (N), a nutrição adequada deste elemento aumenta a assimilação de CO 2 e o conteúdo de clorofila, influenciando beneficamente o desenvolvimento das plantas de pinhão-manso (MATOS et al, 2012). Ademais, por meio da adubação nitrogenada o cultivo do pinhão-manso pode ser otimizado, promovendo o incremento do número total de frutos/sementes produzidos por plantas (YONG et al, 2010).…”

Section: Nutrição Mineral Do Pinhão-mansounclassified

“…A biossíntese de putrescina durante a deficiência de K é uma resposta ao desequilíbrio iônico causado pela acidificação do suco celular intensificado pelo excesso de amônio, bem como pelo aumento da atividade das enzimas que convertem arginina, ornitina e citrulina em putrescina (MALAVOLTA, 2006). Por sua vez, a putrescina é convertida a espermidina e espermina por sucessivas transferências de um ou dois grupos aminopropil via descarboxilação do Sadenosil metionina, sendo que esse processo também é regulado em parte pelo K (TIBURCIO; GENDY; TRANTHANH- VAN, 1989;MALAVOLTA, 2006 (LU et al, 2002;YONG et al, 2010;MATOS et al, 2012;SANTOS et al, 2013).…”

Section: Nutrição Mineral Do Pinhão-mansounclassified

“…Tabela 5 -Coeficiente de correlação de Pearson (r) e respectivas significâncias estatísticas pelo teste t, obtidas entre as concentrações foliares de N nas omissões individuais de N, P, K e S (X) e a atividade da redutase do nitrato (Y) em folhas recém-expandidas de pinhão-manso desenvolvido em solução completa e com omissão de N, P, K e S Matos et al (2012), no período de senescência foliar do pinhão-manso, grande parte do nitrato foi reduzido e alocado para a produção de pigmentos fotossintéticos, especialmente a clorofila a e b. Desta maneira a alta quantidade de nitrato já utilizada pelo metabolismo vegetal, corrobora para a maior alocação de nitrato apenas para os pontos de crescimento (folhas em expansão -forte dreno), explicando a baixa atividade da enzima na terceira e quarta folha recém-expandida em mudas de pinhão-manso aos 120 DAT.…”

Section: Atividade Da Redutase Do Nitratounclassified

See 1 more Smart Citation

Avaliações bioquímicas e fisiológicas para previsão de desordens nutricionais de macronutrientes no desenvolvimento inicial do pinhão-manso

Santos¹

View full text Add to dashboard Cite

Physiological characterization of leaf senescence of Jatropha curcas L. populations

Cited by 26 publications

References 19 publications

Diversity and genetic parameter estimates for yield and its components in Jatropha curcas L.

Diversity and genetic parameter estimates for yield and its components in Jatropha curcas L.

Sinkronisasi Source dan Sink untuk Peningkatan Produktivitas Biji pada Tanaman Jarak Pagar

Avaliações bioquímicas e fisiológicas para previsão de desordens nutricionais de macronutrientes no desenvolvimento inicial do pinhão-manso

Contact Info

Product

Resources

About