The Improved Japanese variety of cauliflower was introduced from:

✅Explanation:
It is an introduction from Israel.  Plants are erect Leaves are bluish green.  It cannot tolerate hot season.  It is recommended for sowing in north Indian plains from July end to early August. Curds are compact, white and maturing in late November to mid-December at 16-20oC.

🛑 Additional Information:::

• Some Other Varieties of Cauliflower:
Dania: Developed by IARI, Kalimpong for eastern hilly areas; stress-tolerant, medium-sized curd.
Early Kunwari: Early variety for Punjab, Haryana, Himachal Pradesh, Delhi; bluish-green leaves, semi-spherical curds, suitable for mid-May sowing.
Hisar-1: Mid-late season, medium to large white heads, 250 q/ha yield.
Improved Japanese: Introduced from Israel; erect plants, bluish-green leaves, tolerant to cold, compact white curds, for July-August sowing in northern plains.
Pant Gobi-2: Developed from GBPUA&T, Pantnagar; ready from October, yields 100 q/ha.
Pant Gobi-3: Synthetic variety from eight inbred lines; medium compact creamy white curds, 120 q/ha yield.
Pant Gobi-4: Released from GBPUA&T; medium plants, solid round white curds, free from riceyness.
Pant Shubra: Developed through recurrent selection at GBPUA&T, Pantnagar; compact, non-ricey curds, suitable for rainy season.
Punjab Giant-26: Main season variety from PAU, Ludhiana; solid medium-sized white curds.
Punjab Giant-35: Late season variety, compact, snow-white curds, 225 q/ha yield.
Pusa Aghani: Developed by IARI, large solid white curds, 150-160 q/ha yield.
Pusa Deepali: Developed from local material, medium plants, compact self-blanching white curds, recommended for sowing in late May to early June.
Pusa Early Synthetic: Released by IARI in 1990, small to medium creamy white curds, suitable for early cultivation.
Pusa Him Jyoti: Released by IARI for transplanting in hill tracts; solid, round white curds, 160 q/ha yield.
Pusa Hybrid-2: Released by IARI, resistant to downy mildew, creamy-white compact curds, high yield (230-250 q/ha).
Pusa Katki: Early variety from IARI, medium plants with bluish-green waxy leaves; maturing in October-November.
Pusa Sharad: Released in 1999, early maturity, compact white curds, high yield (260 q/ha).
Pusa Shubra: Erect plants, long stalks, light bluish-green leaves, compact white curds, 250-300 q/ha yield.
Pusa Snowball-1: Late variety, very compact white curds, sowing from mid-September to October.
Pusa Snowball-2: Suitable for late sowing, snow-white curds, ready by end of January or early February.
Pusa Snowball K-1: Best quality snow-white curds, tolerant to black rot, late maturity.
Pusa Synthetic: Mid-season variety, creamy-white compact curds, suitable for sowing mid to late September in North India.
Pawas: Early crop, ready in 60 days after transplanting, 700-800 g curd weight.
Swarna: Grown September to December; white, compact curds, 1-2.5 kg average curd weight.
Summer King: Early summer variety, whitish round curds, ready in 65 days with 400-500 g curd weight.