heterosis             package:agricolae             R Documentation

_D_a_t_a _o_f _p_o_t_a_t_o, _H_e_t_e_r_o_s_i_s

_D_e_s_c_r_i_p_t_i_o_n:

     Determination of heterosis, general combining ability (GCA) and 
     specific combining ability in tuber dry matter, reducing sugars
     and  agronomic characteristics in TPS families.

_U_s_a_g_e:

     data(heterosis)

_F_o_r_m_a_t:

     A data frame with 216 observations on the following 11 variables.

     '_P_l_a_c_e' 1: La Molina, 2=Huancayo

     '_R_e_p_l_i_c_a_t_i_o_n' a numeric vector

     '_T_r_e_a_t_m_e_n_t' a numeric vector

     '_F_a_c_t_o_r' a factor with levels 'Control' 'progenie' 'progenitor'
          'testigo'

     '_F_e_m_a_l_e' a factor with levels 'Achirana' 'LT-8' 'MF-I' 'MF-II'
          'Serrana' 'TPS-2' 'TPS-25' 'TPS-7'

     '_M_a_l_e' a factor with levels 'TPS-13' 'TPS-67' 'TS-15'

     '_v_1' Yield (Kg/plant)

     '_v_2' Reducing sugars (scale):1 low and 5=High

     '_v_3' Tuber dry matter (percentage)

     '_v_4' Tuber number/plant

     '_v_5' Average tuber weight (g)

_D_e_t_a_i_l_s:

     The study was conducted in 3 environments, La Molina-PERU to 240
     masl. during  autumn-winter and spring, and in Huancayo-PERU 3180
     masl., during summer.  The experimental material consisted of 24
     families half brother in the form  of tubers derived from TPS,
     obtained crossing between 8 female and 3 male parents.  Design
     used was randomized complete block with three repetitions.  The
     experimental unit was 30 plants in two rows at a distance of 30cm 
     between plants and 90 cm between rows. Variables evaluated were
     Yield, Tubers number,  Dry matter and content and reducing sugars.
     The analysis was conducted  line x tester. The control variety was
     Desiree.

_S_o_u_r_c_e:

     International Potato Center(CIP). Lima-Peru. Data Kindly provided
     by of Rolando Cabello.

_R_e_f_e_r_e_n_c_e_s:

     Tesis "Heterosis, habilidad combinatoria general y especifica para
     materia seca,  azucares reductores y caracteres agronomicos en
     familias de tuberculos provenientes  de semilla sexual de papa.
     Magister Scientiae Rodolfo Valdivia Lorente. Universidad  Nacional
     Agraria La molina-Lima Peru, Escuela de Post Grado, Mejoramiento
     genetico de plantas, 2004". Poster: Congreso de la Sociedad
     Peruana de Genetica - Peru, 2008.

_E_x_a_m_p_l_e_s:

     library(agricolae)
     data(heterosis)
     str(heterosis)
     site1<-subset(heterosis,heterosis[,1]==1)
     site2<-subset(heterosis,heterosis[,1]==2)
     site3<-subset(heterosis,heterosis[,1]==3)
     attach(site1)
     model1<-lineXtester(Replication, Female, Male, v1)
     DFe <- df.residual(model1)
     CMe <- deviance(model1)/DFe
     test1 <- HSD.test(v1, Factor,DFe,CMe)
     test2 <- HSD.test(v1, Treatment,DFe,CMe)
     detach(site1)
     attach(site2)
     model22<-lineXtester(Replication, Female, Male, v3)
     detach(site2)
     attach(site3)
     model3<-lineXtester(Replication, Female, Male, v4)
     detach(site3)

