Search Results - "Johnson, Susan D."

Sexual reproduction is the default mode in apomictic Hieracium subgenus Pilosella, in which two dominant loci function to enable apomixis by Koltunow, Anna M.G, Johnson, Susan D, Rodrigues, Julio C.M, Okada, Takashi, Hu, Yingkao, Tsuchiya, Tohru, Wilson, Saira, Fletcher, Pam, Ito, Kanae, Suzuki, Go, Mukai, Yasuhiko, Fehrer, Judith, Bicknell, Ross A

“…Asexual seed formation, or apomixis, in the Hieracium subgenus Pilosella is controlled by two dominant independent genetic loci, LOSS OF APOMEIOSIS (LOA) and…”
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The LOSS OF APOMEIOSIS (LOA) locus in Hieracium praealtum can function independently of the associated large-scale repetitive chromosomal structure by Kotani, Yoshiko, Henderson, Steven T., Suzuki, Go, Johnson, Susan D., Okada, Takashi, Siddons, Hayley, Mukai, Yasuhiko, Koltunow, Anna M. G.

“…Apomixis or asexual seed formation in Hieracium praealtum (Asteraceae) is controlled by two independent dominant loci. One of these, the LOSS OF APOMEIOSIS…”
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KNUCKLES (KNU) encodes a C2H2 zinc-finger protein that regulates development of basal pattern elements of the Arabidopsis gynoecium by Payne, Thomas, Johnson, Susan D, Koltunow, Anna M

“…Flowers of the parthenocarpic knuckles mutant are conditionally male sterile and contain ectopic stamens and carpels that originate from placental tissue…”
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Genetic separation of autonomous endosperm formation (AutE) from the two other components of apomixis in Hieracium by Ogawa, Daisuke, Johnson, Susan D, Henderson, Steven T, Koltunow, Anna M. G

“…In apomictic Hieracium subgenus Pilosella species, embryo sacs develop in ovules without meiosis. Embryo and endosperm formation then occur without…”
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Assembled genomic and tissue-specific transcriptomic data resources for two genetically distinct lines of Cowpea (Vigna unguiculata (L.) Walp) by Spriggs, Andrew, Henderson, Steven T., Hand, Melanie L., Johnson, Susan D., Taylor, Jennifer M., Koltunow, Anna

“…Cowpea ( Vigna unguiculata (L.) Walp) is an important legume crop for food security in areas of low-input and smallholder farming throughout Africa and Asia…”
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Sexual and Apomictic Seed Formation in Hieracium Requires the Plant Polycomb-Group Gene FERTILIZATION INDEPENDENT ENDOSPERM by Rodrigues, Julio C.M, Tucker, Matthew R, Johnson, Susan D, Hrmova, Maria, Koltunow, Anna M.G

“…A Polycomb-Group (PcG) complex, FERTILIZATION INDEPENDENT SEED (FIS), represses endosperm development in Arabidopsis thaliana until fertilization occurs. The…”
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Sporophytic ovule tissues modulate the initiation and progression of apomixis in Hieracium by TUCKER, Matthew R, OKADA, Takashi, JOHNSON, Susan D, TAKAIWA, Fumio, KOLTUNOW, Anna M. G

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Assembled genomic and tissue-specific transcriptomic data resources for two genetically distinct lines of Cowpea ( Vigna unguiculata (L.) Walp) by Spriggs, Andrew, Henderson, Steven T, Hand, Melanie L, Johnson, Susan D, Taylor, Jennifer M, Koltunow, Anna

“…Cowpea ( (L.) Walp) is an important legume crop for food security in areas of low-input and smallholder farming throughout Africa and Asia. Genetic…”
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AUXIN RESPONSE FACTOR8 Is a Negative Regulator of Fruit Initiation in Arabidopsis by Goetz, Marc, Vivian-Smith, Adam, Johnson, Susan D, Koltunow, Anna M

“…Fruit and seed formation in plants is normally initiated after pollination and fertilization, and, in the absence of fertilization, flowers senesce. In the…”
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Expression of Aberrant Forms of AUXIN RESPONSE FACTOR8 Stimulates Parthenocarpy in Arabidopsis and Tomato by Goetz, Marc, Hooper, Lauren C, Johnson, Susan D, Rodrigues, Julio Carlyle Macedo, Vivian-Smith, Adam, Koltunow, Anna M

“…Fruit initiation in Arabidopsis (Arabidopsis thaliana) is generally repressed until fertilization occurs. However, mutations in AUXIN RESPONSE FACTOR8 (ARF8)…”
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Asexual Female Gametogenesis Involves Contact with a Sexually Fated Megaspore in Apomictic Hieracium by Juranić, Martina, Tucker, Matthew R., Schultz, Carolyn J., Shirley, Neil J., Taylor, Jennifer M., Spriggs, Andrew, Johnson, Susan D., Bulone, Vincent, Koltunow, Anna M.

“…Apomixis results in asexual seed formation where progeny are identical to the maternal plant. In ovules of apomictic species of the Hieracium subgenus…”
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Phenotypic plasticity of aposporous embryo sac development in Hieracium praealtum by Juranić, Martina, Johnson, Susan D., Koltunow, Anna M.

“…Apomixis in Hieracium praealtum follows a developmental pathway of apospory, where an unreduced embryo sac develops from a somatic ovule cell without meiosis…”
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Genetic analyses of the inheritance and expressivity of autonomous endosperm formation in Hieracium with different modes of embryo sac and seed formation by Henderson, Steven T., Johnson, Susan D., Eichmann, Joel, Koltunow, Anna M. G.

“…Apomixis, or asexual seed formation, in polyploid Hieracium subgenus Pilosella species results in clonal progeny with a maternal genotype. An aposporous embryo…”
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Enlarging Cells Initiating Apomixis in Hieracium praealtum Transition to an Embryo Sac Program prior to Entering Mitosis by Okada, Takashi, Hu, Yingkao, Tucker, Matthew R., Taylor, Jennifer M., Johnson, Susan D., Spriggs, Andrew, Tsuchiya, Tohru, Oelkers, Karsten, Rodrigues, Julio C.M., Koltunow, Anna M.G.

“…Hieracium praealtum forms seeds asexually by apomixis. During ovule development, sexual reproduction initiates with megaspore mother cell entry into meiosis…”
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Chromosomes Carrying Meiotic Avoidance Loci in Three Apomictic Eudicot Hieracium Subgenus Pilosella Species Share Structural Features with Two Monocot Apomicts by Okada, Takashi, Ito, Kanae, Johnson, Susan D., Oelkers, Karsten, Suzuki, Go, Houben, Andreas, Mukai, Yasuhiko, Koltunow, Anna M.

“…The LOSS OF APOMEIOSIS (LOA) locus is one of two dominant loci known to control apomixis in the eudicot Hieracium praealtum. LOA stimulates the differentiation…”
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Sporophytic ovule tissues modulate the initiation and progression of apomixis in Hieracium by Tucker, Matthew R, Okada, Takashi, Johnson, Susan D, Takaiwa, Fumio, Koltunow, Anna M G

“…Apomixis in Hieracium subgenus Pilosella initiates in ovules when sporophytic cells termed aposporous initial (AI) cells enlarge near sexual cells undergoing…”
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Expression of rolB in apomictic Hieracium piloselloides Vill. causes ectopic meristems in planta and changes in ovule formation, where apomixis initiates at higher frequency by Koltunow, Anna M., Johnson, Susan D., Lynch, Matthew, Yoshihara, Toshihiro, Costantino, Paolo

“…The effects of the Agrobacterium rhizogenes rolB oncogene on apomixis were examined in the facultative apomictic plant Hieracium piloselloides because the…”
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Generation of an integrated Hieracium genomic and transcriptomic resource enables exploration of small RNA pathways during apomixis initiation by Rabiger, David S, Taylor, Jennifer M, Spriggs, Andrew, Hand, Melanie L, Henderson, Steven T, Johnson, Susan D, Oelkers, Karsten, Hrmova, Maria, Saito, Keisuke, Suzuki, Go, Mukai, Yasuhiko, Carroll, Bernard J, Koltunow, Anna M G

“…Application of apomixis, or asexual seed formation, in crop breeding would allow rapid fixation of complex traits, economizing improved crop delivery…”
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Parental Genome Imbalance Causes Post-Zygotic Seed Lethality and Deregulates Imprinting in Rice by Zhang, Hong-yu, Luo, Ming, Johnson, Susan D., Zhu, Xiao-wei, Liu, Lei, Huang, Fang, Liu, Yu-tong, Xu, Pei-zhou, Wu, Xian-jun

“…Background Reproductive isolation between rice of different ploidy levels is manifested as endosperm and embryo abortion in seeds produced by interploidy…”
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Apomixis in hawkweed: Mendel's experimental nemesis by Koltunow, Anna M.G, Johnson, Susan D, Okada, Takashi

“…Mendel used hawkweeds and other plants to verify the laws of inheritance he discovered using PISUM: Trait segregation was not evident in hawkweeds because many…”
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