04073nab a2200313 i 4500003000900000005001700009008004100026040001800067072000800085072000800093100004600101100003600147100003000183100003000213245005300243500006700296520143700363520156201800650001303362650001403375650002903389650001503418650001203433650001903445773018903464856007903653942000803732999001903740BR-BrBNA20260518142933.0260518b2021    bl.qr|pooa||| 00| 0 eng |  aBR-BrBNAbeng  aF03  aH50  aSilva, João Henrique Constantino Sales   aAzerêdo, Gilvaneide Alves de   aFerreira, Wagner de Melo   aSouza, Vênia Camelo de   aWater restriction in seeds of Cereus jamacaru DC  a

Publicação online; 36 ref.; 3 illus.; Summaries (En, Pt)  a


ABSTRACT:       Mandacaru  (Cereus  jamacaru  DC.)  is  a  cactus  widely  found  in  the  Caatinga,  with  its  seeds  usually  subjected  to  adverse conditions. Therefore, the objective of this study was to evaluate the effect of water restriction on germination and vigor of mandacaru seeds by using different salts and osmotic potentials. To that end, we  used saline solutions of NaCl, KCl, CaCl2 and MgCl2 prepared at the osmotic potentials of 0.0; -0.2; -0.4; -0.6; -0.8; -1.0 and -1.2 MPa. Four replicates of 50 seeds per treatment were  used,  distributed  in  “gerbox”  boxes  between  blotter  paper  and  under  temperature  of  25  °C.  Counts  of  the  number  of  germinated seeds were performed daily for 21 days after root protrusion. The variables analyzed were the following: water content (%), germination (%), mean germination time and normal seedlings (%). A completely randomized following the factorial scheme 4 × 7 (salts × osmotic potentials) was employed. Results obtained suggest that mandacaru seeds show the ability to germinate in saline soils, a characteristic found in arid and semi-arid areas. Decreased osmotic potential promoted reductions in germination (%) and vigor of Cereus jamacaru DC seeds. The MgCl2 salt was the one that most negatively affected the germination and initial seedling development. 


Key words:      Caatinga; Cactaceae; mandacaru; osmotic potentials; salinity  a


RESUMO:       O mandacaru (Cereus jamacaru DC.) é uma cactácea de ampla ocorrência na Caatinga e as suas sementes geralmente estão submetidas à condições adversas. Assim sendo, objetivou-se avaliar o efeito da restrição hídrica sobre a germinação e o vigor de sementes de mandacaru em meios germinativos sob diferentes sais e potenciais osmóticos. Foram utilizados os sais NaCl, KCl, CaCl2 e MgCl2 nos potenciais osmóticos: 0,0; -0,2; -0,4; -0,6; -0,8; -1,0 e -1,2 MPa. Foram usadas quatro repetições de 50 sementes por tratamento, distribuídas em caixas tipo “gerbox” entre papel “mata borrão”, sob a temperatura de 25 °C. As  contagens  do  número  de  sementes  germinadas  foram  realizadas  diariamente  durante  21  dias  após  a  protrusão  radicular.  As  variáveis  analisadas  foram:  teor  de  água  (%),  germinação  (%),  tempo  médio  de  germinação  e  plântulas  normais  (%).  O  delineamento foi inteiramente casualizado seguindo o esquema fatorial 4 × 7 (sais × potenciais osmóticos). Os resultados obtidos sugerem que as sementes de mandacaru são capazes de germinar em solos salinos, característica observada em áreas áridas e semiáridas. O decréscimo do potencial osmótico provocou redução da germinação e do vigor das sementes de Cereus jamacaru DC. O sal MgCl2 foi o que mais afetou a germinação e o desenvolvimento inicial das plântulas. 


Palavras-chave:       Caatinga; Cactaceae; mandacaru; potenciais osmóticos; salinidade  aCAATINGA  aCACTACEAE  aDEFICIÊNCIA  HÍDRICA  aSALINIDADE  aSEMENTE  aGERMINAÇÃO0 046569362080dRecife-PE Universidade Federal Rural de Pernambuco 2006o2026-2072tRevista Brasileira de Ciências Agrárias (Brazil)x1981-1160gv. 16(2) p. 1-7; (2021)wBR2026000605  uhttp://www.agraria.pro.br/ojs32/index.php/RBCA/article/view/v16i2a8431/653  cANA  c341821d341821