﻿186 
  

  

  The 
  Genetics 
  of 
  " 
  Rogues 
  " 
  among 
  Culinary 
  Peas 
  (Pisum 
  sativum). 
  

  

  By 
  W. 
  Bateson, 
  M.A., 
  F.R.S., 
  and 
  Caroline 
  Pellew, 
  Student 
  of 
  the 
  John 
  

   Innes 
  Horticultural 
  Institution. 
  

  

  (Received 
  January 
  5, 
  1920.) 
  

  

  In 
  1915 
  we 
  described 
  observations 
  and 
  experiments 
  on 
  rogue 
  peas. 
  Our 
  

   results 
  up 
  to 
  the 
  end 
  of 
  1914 
  were 
  as 
  follows: 
  — 
  

  

  (1) 
  Rogues 
  arise 
  sporadically 
  from 
  self-fertilised 
  seeds 
  of 
  various 
  races 
  of 
  

   typical 
  high-class 
  peas. 
  

  

  (2) 
  These 
  rogues 
  are 
  characterised 
  by 
  pointed 
  leaflets 
  and 
  upward-curving 
  

   pods. 
  Their 
  foliar 
  organs, 
  stipules, 
  leaflets, 
  sepals, 
  petals, 
  and 
  carpels 
  are 
  all 
  

   narrower 
  than 
  those 
  of 
  the 
  types. 
  It 
  is 
  especially 
  characteristic 
  of 
  rogues 
  

   that 
  their 
  leaflets 
  end 
  in 
  points 
  instead 
  of 
  the 
  emarginate 
  apices 
  proper 
  to 
  the 
  

   types. 
  Their 
  seeds 
  are, 
  on 
  an 
  average, 
  slightly 
  smaller. 
  Such 
  plants 
  have 
  a 
  

   curiously 
  wild 
  appearance, 
  which 
  contrasts 
  greatly 
  with 
  the 
  ampler 
  propor- 
  

   tions 
  of 
  the 
  types. 
  

  

  (3) 
  Rogues, 
  self 
  -fertilised, 
  produce 
  rogues 
  exclusively. 
  

  

  (4) 
  Rogues 
  crossed 
  with 
  types, 
  whichever 
  way 
  the 
  cross 
  be 
  made, 
  give 
  F 
  x 
  

   plants 
  which 
  as 
  seedlings 
  show 
  evident 
  indications 
  of 
  the 
  type-characters, 
  

   having 
  parts 
  much 
  larger 
  than 
  those 
  of 
  rogues 
  at 
  the 
  same 
  age. 
  But 
  these 
  

   plants 
  at 
  an 
  early 
  stage, 
  usually 
  at 
  some 
  node 
  below 
  that 
  at 
  which 
  the 
  first 
  

   flower 
  is 
  borne, 
  change 
  to 
  rogues, 
  producing 
  stipules, 
  leaves, 
  and 
  eventually 
  

   pods, 
  like 
  those 
  of 
  rogues. 
  

  

  (5) 
  The 
  offspring 
  produced 
  by 
  the 
  self-fertilisation 
  of 
  these 
  ¥ 
  x 
  plants 
  are 
  

   exclusively 
  rogues. 
  In 
  some 
  way 
  unexplained 
  the 
  type-characters 
  contributed, 
  

   whether 
  by 
  the 
  father 
  or 
  by 
  the 
  mother, 
  are 
  excluded 
  at 
  an 
  early 
  stage, 
  so 
  

   that 
  they 
  do 
  not 
  reappear 
  in 
  the 
  germ-lineage. 
  

  

  In 
  the 
  variety 
  which 
  we 
  have 
  chiefly 
  studied, 
  Sutton's 
  Early 
  Giant 
  (a 
  

   strain 
  of 
  the 
  well-known 
  G-radus), 
  plants 
  intermediate 
  between 
  types 
  and 
  

   rogues 
  are 
  not 
  uncommon. 
  We 
  have 
  scarcely 
  ever 
  seen 
  such 
  plants 
  in 
  other 
  

   varieties. 
  In 
  them 
  a 
  change 
  in 
  the 
  foliar 
  parts 
  occurs 
  like 
  that 
  described 
  in 
  

   the 
  Fi 
  plants 
  ; 
  but 
  though 
  most 
  frequently 
  completed 
  at 
  or 
  near 
  the 
  first 
  

   flowering 
  node, 
  their 
  transformation 
  may 
  be 
  deferred 
  to 
  a 
  much 
  higher 
  level. 
  

   On 
  such 
  plants 
  the 
  shape 
  of 
  the 
  pods 
  also 
  often 
  changes 
  progressively, 
  lower 
  

   pods 
  being 
  straighter 
  and 
  upper 
  pods 
  curved 
  like 
  those 
  of 
  rogues. 
  These 
  

   intermediate 
  plants 
  form 
  a 
  fairly 
  definite 
  class, 
  though 
  they 
  grade 
  insensibly 
  

   into 
  both 
  the 
  types 
  and 
  the 
  rogues. 
  In 
  recording 
  breeding 
  results 
  we 
  have 
  

   classified 
  the 
  plants 
  into 
  a 
  graduated 
  series 
  of 
  five 
  groups, 
  but 
  for 
  the 
  present 
  

  

  