﻿PLANT 
  BREEDING 
  

  

  189 
  

  

  kind 
  or 
  of 
  one 
  row 
  are 
  thus 
  detasseled, 
  it 
  is 
  made 
  probable 
  that 
  

   pollen, 
  if 
  received 
  at 
  all 
  by 
  the 
  ears 
  of 
  the 
  detasseled 
  stalks, 
  

   must 
  come 
  from 
  another 
  row 
  or 
  from 
  another 
  kind 
  of 
  corn. 
  

   The 
  detasseling 
  of 
  alternate 
  rows 
  is 
  a 
  rather 
  common 
  way 
  

   of 
  insuring 
  cross-pollination. 
  In 
  most 
  cases 
  of 
  hybridizing 
  

   with 
  bisexual 
  flowers 
  it 
  is 
  necessary 
  to 
  carry 
  out 
  processes 
  

   similar 
  to 
  the 
  following 
  ones: 
  

  

  1. 
  Select 
  the 
  flower 
  to 
  be 
  pollinated 
  before 
  it 
  

   opens 
  or 
  before 
  its 
  own 
  pollen 
  is 
  mature. 
  If 
  it 
  is 
  

   one 
  of 
  a 
  cluster 
  of 
  flowers, 
  as 
  in 
  the 
  wheat 
  and 
  

   the 
  apple, 
  remove 
  from 
  the 
  cluster 
  of 
  the 
  flowers 
  

  

  all 
  that 
  are 
  not 
  to 
  

   be 
  operated 
  upon. 
  

   2. 
  Open 
  the 
  re- 
  

   maining 
  flowers 
  

   and 
  remove 
  the 
  

   stamens 
  by 
  taking 
  

   hold 
  of 
  the 
  fila- 
  

   ments 
  with 
  fine 
  

   "S 
  '( 
  

   B 
  

  

  Fig. 
  162. 
  A 
  peacu 
  flower 
  prepared 
  for 
  hybridization 
  

  

  A, 
  flower 
  cut 
  round 
  for 
  removal 
  of 
  the 
  stamens, 
  with 
  

   the 
  removed 
  parts 
  of 
  the 
  young 
  flower 
  showing 
  ahove 
  ; 
  

  

  B, 
  longitudinal 
  section 
  of 
  a 
  flower 
  showing 
  level 
  (s) 
  

  

  at 
  which 
  the 
  cut 
  was 
  made 
  in 
  A 
  

  

  forceps, 
  or 
  cut 
  

   away 
  all 
  the 
  sta- 
  

   mens 
  at 
  once, 
  as 
  

   shown 
  in 
  figure 
  

   162. 
  Keep 
  the 
  

   flower 
  or 
  the 
  en- 
  

   tire 
  twig 
  covered 
  with 
  a 
  paper 
  bag 
  until 
  the 
  stigma 
  is 
  mature. 
  

  

  3. 
  When 
  the 
  stigma 
  is 
  mature, 
  pollinate 
  it 
  with 
  the 
  desired 
  

   kind 
  of 
  pollen. 
  This 
  may 
  be 
  done 
  with 
  the 
  finger 
  tip 
  or 
  with 
  

   a 
  camel's-hair 
  brush 
  or 
  other 
  implement. 
  It 
  is 
  safer 
  to 
  take 
  

   pollen 
  from 
  a 
  flower 
  that 
  has 
  been 
  kept 
  covered 
  with 
  a 
  paper 
  

   bag 
  to 
  keep 
  off 
  foreign 
  pollen. 
  

  

  4. 
  Keep 
  the 
  pollinated 
  flower 
  covered 
  with 
  a 
  paper 
  bag 
  

   until 
  the 
  fruit 
  has 
  grown 
  considerably. 
  

  

  178. 
  Plants 
  grown 
  from 
  hybrid 
  seeds. 
  When 
  seeds 
  pro- 
  

   duced 
  by 
  hybridization 
  are 
  planted, 
  the 
  seedlings 
  grown 
  from 
  

   them 
  may 
  vary 
  greatly 
  in 
  their 
  vegetative 
  characters, 
  as 
  size, 
  

  

  