tobbaco, Introduction, breeding objectives, selfing and crossing technique.

Tobbaco, Minor crop in Pakistan, Its Introduction, breeding objectives, selfing and crossing technique.

1. TOBACO ASJID AMMAR 2022-AG-9051

2. INTRODUCTION Common Name : TOBACCO OR TAMBACCO Technical name : Nicotiana tabacum Chromosome numbers : 2n=4x=48

3. INTRODUCTION Nicotiana tabacum is allotetraploid specie Arose by hybridization of N.Sylvestris and N.Tomentosiformis 65 species of which two cultivated ( N.tabacum or N.rustica )

4. PLANT BIOLOGY Annual and perennial herb Stem: erect ,tall growing ,rigid and hairy Growth: Tobbaco plant can grow upto 2meter tall Leaves: broad lanceolate alternate

5. FLOWER BIOLOGY Inflorescence is terminal panicle and bi s exual Calyx : Five , cylindrical or narrow pointed United at base Carolla : Greenish yellow , tubular ,broadly with contraction near the mouth Anderoecium : stamens five ,four long and one short

6. FLOWER BIOLOGY Gynoecium : Cvary superior Style sylender Stigma capitat Fruite : Flattened circular Seed very small Oval dusty brown

7. SELFING AND CROSSING IN TOBBACO SELFING : 1.BAGGING Bag the flower for selfing to avoid natural crossing by insects

8. SELFING AND CROSSING IN TOBACCO Emasculation : Removal of the male part (anther) Select the unopened flowers with pink color tip and anther are removed with fine forceps after tearing petals. Crossing : 1. Collect the pollen grain from matured flower 2.Dust it on emasculated flower 3. bag the pollinated flower and than tag it