Preferential Geographic Distribution Pattern of Abiotic Stress Tolerant Rice

Rice

Table 2 Preferential Geographic Distribution Pattern of Abiotic Stress Tolerant Rice Accessions

Abiotic stress		Total number of accessions screened	Highly tolerant accessions^a	Preferred latitude	Preferred longitude	Highly tolerant accessions (%)	No of highly tolerant accessions from Bangladesh	Highly tolerant accessions from Bangladesh (%)
Cold		6612	81	20-24°N	90-110°E	1.2	16	19.8
Salt		8004	31	20-24°N	90-100°E	0.4	26	83.9
Alkali		2649	83	20-24°N	90-100°E	3.1	48	57.8
Zinc	Field	960	0	20-24°N	90-100°E	0.0	(13)^b	(28.3)^b
Zinc	Greenhouse	119	3	20-24°N	80-90°E	2.5	NA	NA
Deepwater		1200	64	20-24°N	90-100°E	5.3	61	95.3
Flash flood		18,087	371	20-28°N	80-90°E	2.1	51	13.7
Flooded seed germination (AG)		8114	6	20-24°N	90-100°E	0.1	2	33.3
Drought - yield performance		988	66	20-24°N	90-100°E	5.3^c	24	36.4
Drought -non-yield performance screening		38,433	na	na	na	0-37.6	2750	0-28.4

na not analysed as vegetative stage drought tolerance is not correlated with yield performance, NA no accession of Bangladesh screened
^aList of highly tolerant accessions can be found in Additional file 4: Table S1
^bTolerant accessions were considered for rarity estimation, as no accession was found highly tolerant in the zinc-deficient field screening
^cAlthough 6.7% accessions were found drought tolerant after field screening by yield performance, however, drought tolerant accessions were defined as any accessions that appeared in the top 25% in grain yield in any crop seasons (Torres et al. 2013). However, we excluded accessions of wet-season that were included in the top 25% in grain yield