Page 4 - 2.Lesson_notes-Asexual_Reproduction_2
P. 4

(b)   Artificial method


                           Artificial  methods  include  cutting,  grafting,  layering  and  plant  tissue
                            culture  is  carried  out  to  grow  many  plants  like  sugarcane,  roses,  or
                            grapes for agricultural purposes.
                           Cutting → eg. Rose
                           Layering → eg. Strawberry, lemon
                           Grafting → eg. Mango, rose
                           Micropropagation → eg. Orchids, Dahlia

               Cutting
                     The small piece of any plant organ (stem, root or leaf) used for propagation is
                       called Cutting. Stem cuttings are most commonly employed for propagation of
                       many horticultural plants, such as, grape, rose, sugarcane, etc.
                     In  this  method,  about  20-30  cm  long  pieces  of  stem  are  placed  in  natural
                       position in the wet soil. It gives off roots from the lower end and shoot buds
                       from the aerial nodes.
                     A cutting develops a new plant similar to the parent plant. A plant, such as,
                       Rose,  Banana,  Cactus,  Bougainvillea,  Chrysanthemum  can  be  grown  by
                       means of cuttings.

               Layering
                     Layering  has  evolved  as  a  common  means  of  vegetative  propagation  of
                       numerous species in natural environments.
                     Layering is also utilized by horticulturists to propagate desirable plants.
                     Natural  layering  typically  occurs  when  a  branch  touches  the  ground,
                       whereupon it produces adventitious roots.
                     Simple layering is done by bending a stem until the middle touches the soil.
                     Push the centre of the stem underground and hold it in place with a U-shaped
                       pin. Roots will form along the part of the stem that is underground. Example –
                       Jasmine.






                                                            4
   1   2   3   4   5   6