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• W1120380091 abstract "Four main flowering genes Lf , Sn , E and Hr determine the flowering behavior of five maturity classes described in pea ( Pisum sativum L.): day neutral (DN), early initiation (EI), late (L), late high response (LHR) and very late (VL). The objective of this research is to determine the timing of photoperiod sensitivity during pre-flowering development for seven genotypes representing all five maturity classes. That is, to estimate the duration of the pre-inductive ( a 1 ), inductive ( I ) and post-inductive ( a 3 ) phases, and to determine the moment of floral initiation. Plants were transferred from long days (20 h·d -1 ) to short days (11,5 h·d -1 ) and vice versa at different times after sowing. The duration of preflowering phases was determined using the procedure described by Ellis et al. (Annals of Botany 70: 87-92, 1992), based on the durations from sowing to flowering. Class DN ( sn ) was defined by the absence of an inductive phase. The inductive phase started later for the genotypes of class EI ( lf E Sn ) and was shorter than for genotypes of classes L ( e Sn hr ) and LHR ( e Sn Hr ). Class VL ( Lf  d Sn Hr ) had the longest inductive phase. Floral initiation followed the allelic sequence of locus Lf , modified by the presence of Sn and E . Results show how genes Lf , Sn , E and Hr modify the durations of pre-flowering phases and flower initiation to explain the characteristic flowering behavior of maturity classes. Cuatro genes principales Lf, Sn, E y Hr determinan las cinco clases de madurez descritas en arveja ( Pisum sativum L.), las que difieren en su tiempo a floracion: dia neutro (DN), iniciacion temprana (EI), tardia (L), tardia con respuesta aumentada (LHR) y muy tardia (VL). El objetivo de este estudio fue determinar a partir de que momento y hasta cuando plantas representativas de las respectivas clases de madurez son sensibles a fotoperiodo; es decir, estimar la duracion de las fases pre-inductiva (a 1 ), inductiva (I) y postinductiva (a 3 ) para cada uno de los siete genotipos evaluados, ademas de determinar el momento de iniciacion floral. Las plantas fueron transferidas de regimenes de dia largo (20 h.d -1 ) a dia corto (11,5 h.d -1 ) y viceversa a distintos tiempos despues de siembra. A partir de los tiempos desde siembra a floracion se determino, mediante el procedimiento propuesto por Ellis et al. (Annals of Botany 70:87-92, 1992), la duracion de cada una de las fases. La clase DN ( sn ) se caracterizo por la ausencia de fase inductiva. En la clase EI (lf E Sn) la fase inductiva comenzo mas tarde y tuvo menor duracion que en los genotipos L ( e Sn hr ) y LHR ( e Sn Hr ), y la clase VL ( Lf  d Sn Hr ) presento la fase inductiva mas larga de todas. La iniciacion floral siguio la secuencia alelica del locus Lf , modificado por la presencia de Sn y E . Los resultados muestran como los genes Lf, Sn, E y Hr modifican la duracion de las fases de prefloracion y la iniciacion floral para explicar los diferentes comportamientos de floracion de las clases de madurez." @default.
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• W1120380091 date "2003-04-05" @default.
• W1120380091 modified "2023-09-24" @default.
• W1120380091 title "Photoperiod sensitive phases of preflowering development in pea (Pisum sativum L.)." @default.
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• W1120380091 doi "https://doi.org/10.7764/rcia.v30i1.259" @default.
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