Vol. 10, Issue 7 (2021)

Author(s):
DK Zate, Faria Khan, AH Rathod and LN Jawale

Abstract:
The experiment comprised the study of heterosis and inbreeding depression using P₁, P₂, F₁, F₂, B₁ and B₂ generations of four crosses viz., (Parbhani Kranti X VROR-159, Parbhani Kranti X Kashi Pragati, Kashi Satadhari X VROR-159 and Kashi Satadhari X BO-2) along with two checks i.e. Mahyco Bhindi No.10 and Pusa Sawani were used to study relative heterosis heterobeltiosis, standard heterosis and inbreeding depression for Plant height (cm), Internodal length (cm), Number of nodes on main stem, Number of branches per plant, Days to first flowering. Days to 50% flowering, first fruiting node. Fruit length (cm), Fruit diameter (cm), Fruit weight (gm), Number of ridges per fruit, Number of fruits per plant, Marketable Fruit yield per plant (gm) Yield per plot (Kg), Yield (q/ha.), Incidence of Fruit and shoot borer. (%) and Incidence of Yellow vein mosaic (%) in okra (A. esculentus (L.) Moench). In heterosis and inbreeding study of F₁ and F₂ generation, relative heterosis ranges from -46.29% for first fruiting nodes to 44.41% for number of nodes on main stem. The highest relative heterosis for fruit yield per plant in F₁ hybrid cross Kashi Satadhari × BO-2 (18.83%) followed by Parbhani Kranti × VROR-159 (15.81%) were recorded over mid parent. However, highest heterobeltiosis in Kashi Satadhari × BO-2 (15.00%) and Parbhani Kranti × VROR-159 (11.68%) and highest standard heterosis observed in Parbhani Kranti × VROR-159 over Pusa Sawani (24.04%) and Mahyco Bhindi No.(19.31%). However, highest positive relative heterosis recorded in Kashi Satadhari × BO-2 (44.41%) for first fruiting nodes and negative relative heterosis observed in Kashi Satadhari × VROR-159 (-46.29%). Inbreeding depression ranges from -106.89% for first fruiting nodes in cross Kashi Satadhari × VROR-159 to 25.81% for internodal length in cross kashi Satadhari × BO-2. However, Inbreeding depression for marketable fruit yield per plant (g) was highest observed in Parbhani Kranti × Kashi Pragati (12.45%) followed by Parbhani Kranti × VROR-159 (12.07%).